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Search: Posts Made By: Fast355
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Forum: Cooling
Yesterday, 02:38 PM
Replies: 11
Views: 98
Posted By Fast355

Re: Mounting pusher fan

You do not want the fan mounted to the radiator at all if you can avoid it. Hayden 253 strap kit and plastic feet that match the fan is what I use to mount them. I attach the feet to the core...
Forum: Engine Swap
05-04-2024, 05:13 PM
Replies: 4
Views: 138
Posted By Fast355

Re: More 305 to 350 questions.

It is not. Personally not a fan of aftermarket EFI controllers. In fact about to swap the garbage Proflow 4 controller to a P59 with coil near plug on my mild L31. The PF4 runs ok but cannot be...
Forum: Cooling
05-04-2024, 12:12 PM
Replies: 35
Views: 561
Posted By Fast355

Re: A/c woes

I tried adjusting the cycling switch and it is dead. I re-used the OE one on it because they typically do not go bad on this era of vehicle. The slightest rotation of the screw now either kills the...
Forum: Cooling
05-03-2024, 04:02 PM
Replies: 35
Views: 561
Posted By Fast355

Re: A/c woes

This was sitting at idle the other day after the interior had cooled down. On a humid day it blows dense fog out of the vents....
Forum: Cooling
05-03-2024, 02:43 PM
Replies: 35
Views: 561
Posted By Fast355

Re: A/c woes

The 87 LG4 car started with a single shroudless puller fan.

I have seen many fan upgrades applied to them. If I am going electric amd have a typical GM 28 x 17" core radiator, I tend to use the...
Forum: Cooling
05-03-2024, 02:07 PM
Replies: 35
Views: 561
Posted By Fast355

Re: A/c woes

I am too, but I can make them perform far better. On a 115F day, my 97 Express with dual evaporators will get mid to low 30s out of the vents at highway speed.

It was nearly 90F and about 65% RH...
Forum: Cooling
05-03-2024, 02:02 PM
Replies: 35
Views: 561
Posted By Fast355

Re: A/c woes

Given the stock fans do not have a shroud, I would want the largest pusher fan I could put in front of the condenser. My 99 Tahoe has a PCM controlled factory pusher fan that turns on when the ac is...
Forum: Cooling
05-03-2024, 01:54 PM
Replies: 35
Views: 561
Posted By Fast355

Re: A/c woes

This was after the clutch fan engaged and was pulling a massive amount of air across my condenser in the 87 G20. When the fan is freewheeling it is closer to 250-275 psi on a 75F day. On a very hot...
Forum: Cooling
05-03-2024, 01:39 PM
Replies: 35
Views: 561
Posted By Fast355

Re: A/c woes

Pressures do not look too high to me especially for only one fan operating. System sounds low to me. I would add some more refrigerant until the liquid line after the orifice tube and the accumulator...
Forum: Cooling
05-02-2024, 01:02 AM
Replies: 18
Views: 758
Posted By Fast355

Re: GM R12 AC system rebuild

Is in north Texas too. Was sunny, warm and humid the other day, put 100 miles on this. I did end up having to turn the cycling switch adjustment in 1/2 turn as the evaporator was starting to freeze...
Forum: TPI
04-29-2024, 10:03 PM
Replies: 296
Views: 7,700
Posted By Fast355

Re: My custom ported H/C/I L98 refresh thread

I had a TPI and I had it on a 383. Dual plane had more off-idle torque than the TPI. Now that I have run dual plane MPFI manifolds, best of both worlds and they will rev out 6,500 rpm no problem.
Forum: TPI
04-29-2024, 03:23 PM
Replies: 296
Views: 7,700
Posted By Fast355

Re: My custom ported H/C/I L98 refresh thread

TPI is not good at all on a heavy vehicle, unless you want to gear it where it adds its midrange torque. Dual plane intake has more low-speed grunt even with TBI on it.
Forum: Tech / General Engine
04-28-2024, 08:38 PM
Replies: 10
Views: 19,546
Posted By Fast355

Re: Why does the starter keep breaking ??

Most starter issues are a timing advance problem.
Forum: Tech / General Engine
04-26-2024, 10:13 PM
Replies: 10
Views: 258
Posted By Fast355

Re: AC accumulator fitment issues

If the HPS OBS C1500 radiator hoses had been available when I was looking, these interchange and it would have the same radiator hoses.

I bought 25 ft rolls of both 5/8" and 3/4" a few years ago...
Forum: Tech / General Engine
04-26-2024, 08:45 PM
Replies: 10
Views: 258
Posted By Fast355

Re: AC accumulator fitment issues

Low quality junk coming from the ac suppliers now. I also had to add foam to the evaporator core I put in the 87 G20 I just rebuilt the ac system on. I used the wide, peel and stick, adhesive backed...
Forum: Alternative Port EFI Intakes
04-26-2024, 01:35 PM
Replies: 21
Views: 465
Posted By Fast355

Re: Revisiting Mercruiser Dual Plane MPFI manifold

Dual plane vs single plane is fairly the same regardless what engine you test it on. The dual plane MPFI manifold has a very flat torque curve compared to a single plane. Not a ton of data on them...
Forum: Alternative Port EFI Intakes
04-26-2024, 11:52 AM
Replies: 21
Views: 465
Posted By Fast355

Re: Revisiting Mercruiser Dual Plane MPFI manifold

Marine engines did use 113s but only with closed cooling systems.

Get over yourself Tom. I gave you two solid dyno graphs of dual planes making substantially more torque than single planes with...
Forum: Alternative Port EFI Intakes
04-25-2024, 11:50 PM
Replies: 21
Views: 465
Posted By Fast355

Re: Revisiting Mercruiser Dual Plane MPFI manifold

Since you like colorful, squigly lines I remembered another dual plane MPFI manifold that has been tested against a single plane MPFI manifold on a 360 Magnum. Mopar Performance sold the M1 single...
Forum: Alternative Port EFI Intakes
04-25-2024, 11:19 PM
Replies: 21
Views: 465
Posted By Fast355

Re: Revisiting Mercruiser Dual Plane MPFI manifold

Well think what you want. IDGAF to be honest. The dual plane far outperforms the single plane in the RPM range I am using it in. Even gave you the dyno chart of a head to head manifold comparison on...
Forum: Alternative Port EFI Intakes
04-25-2024, 10:44 PM
Replies: 21
Views: 465
Posted By Fast355

Re: Revisiting Mercruiser Dual Plane MPFI manifold

The 113s ARE superior to Vortecs under 4,500 rpm on the same short block. Hell TBI heads even make more torque than the Vortecs do under ~4,500 rpm.

You would have had to read the thread. I...
Forum: Tech / General Engine
04-25-2024, 10:39 PM
Replies: 10
Views: 258
Posted By Fast355

Re: AC accumulator fitment issues

Not sure which one you bought off Summit, but these are the units Rock Auto list as being compatible with an 87 V8 car.
...
Forum: Cooling
04-25-2024, 09:07 PM
Replies: 8
Views: 199
Posted By Fast355

Re: Help 1986 Trans Am AC Pancake to rotary Compressor.

The R4 has proven to be a garbage design time and time again. I will not touch one without swapping a Sanden into its place. I have also done a 2.2L S10 V7 swap on one. The V7 works exceptionally...
Forum: Alternative Port EFI Intakes
04-25-2024, 07:43 PM
Replies: 21
Views: 465
Posted By Fast355

Re: Revisiting Mercruiser Dual Plane MPFI manifold

A buddy of mine is running the first merc dual plane, along with an Edelbrock plenum I also had to run a 92mm LS throttle body on his L31 350 that has a 3.50" stroke crank in place of the stock one...
Forum: Alternative Port EFI Intakes
04-25-2024, 07:34 PM
Replies: 21
Views: 465
Posted By Fast355

Re: Revisiting Mercruiser Dual Plane MPFI manifold

I actually decided to find one of the dual plane MPFI manifolds after a Gearhead-EFI member used one on his S10 build. More than one marine engine owner has made 450+ hp and loads of torque using the...
Forum: Alternative Port EFI Intakes
04-25-2024, 06:58 PM
Replies: 21
Views: 465
Posted By Fast355

Re: Revisiting Mercruiser Dual Plane MPFI manifold

Its funny that a marine engine that actually requires torque never uses a single plane either. They are always using some kind of dual plane or port fuel injected manifold with longer runners. Even...
Forum: TPI
04-25-2024, 04:25 PM
Replies: 296
Views: 7,700
Posted By Fast355

Re: My custom ported H/C/I L98 refresh thread

I love that header design. Makes the most average torque of anything you can put on these milder engines. Had a pair years ago on a crossfire car, huge torque gains everywhere. They would probably...
Forum: Alternative Port EFI Intakes
04-25-2024, 04:16 PM
Replies: 21
Views: 465
Posted By Fast355

Re: Revisiting Mercruiser Dual Plane MPFI manifold

My gain was 40 tq at the tire at 2,500 and the dual plane had more torque to 5,000 rpm, then pretty much overlayed the single plane to 5,800 rpm. I also played with a taper spacer on the dual plane....
Forum: Alternative Port EFI Intakes
04-25-2024, 03:36 PM
Replies: 21
Views: 465
Posted By Fast355

Re: Revisiting Mercruiser Dual Plane MPFI manifold

Because I did not have a good set of 113s laying around. I had a good set of 180cc aftermarket vortecs laying around. I was initially going to run this engine with a L31 injection system on it and...
Forum: Alternative Port EFI Intakes
04-25-2024, 01:50 PM
Replies: 21
Views: 465
Posted By Fast355

Re: Revisiting Mercruiser Dual Plane MPFI manifold

Many of these L31 Vortec head port injected builds run around 0.400 BSFC rather than the rule of thumb 0.450, so lower injector duty cycle is kind of expected to me. The stock 22.1# MPFI upgrade...
Forum: Alternative Port EFI Intakes
04-24-2024, 01:21 PM
Replies: 21
Views: 465
Posted By Fast355

Re: Revisiting Mercruiser Dual Plane MPFI manifold

Was able to get some mandrel bent 2.5" tailpipes over the axle this morning. The L31 350 sounds pretty darn good now too and fairly quiet cruising around with the windows up and the ac cranked up.
...
Forum: Cooling
04-23-2024, 07:54 PM
Replies: 18
Views: 758
Posted By Fast355

Re: GM R12 AC system rebuild

Since I finished up the engine work, wiring harness, header install and exhaust work, the engine cover went on and I have been driving it the last 2 days everywhere I go. Cools quickly and gets cold,...
Forum: Alternative Port EFI Intakes
04-22-2024, 08:34 PM
Replies: 21
Views: 465
Posted By Fast355

Revisiting Mercruiser Dual Plane MPFI manifold

Running one on a 10.25:1 L31 with a aftermarket Vortecs with beehive springs, GM 6492 cam, 1.6 rockers and used all the Proflow 4150 parts on the manifold itself. Thorley tri-ys into a dual 2.5"...
Forum: TPI
04-22-2024, 01:56 PM
Replies: 296
Views: 7,700
Posted By Fast355

Re: My custom ported H/C/I L98 refresh thread

It stopped raining, dried up and I drove the dual plane MPFI manifold equipped, mildly cammed L31 around a bit in the early AM hours. It absolutely RIPs. The poor 275/60R15 Cooper Cobra right rear...
Forum: TPI
04-20-2024, 07:34 PM
Replies: 296
Views: 7,700
Posted By Fast355

Re: My custom ported H/C/I L98 refresh thread

My biggest complaint is it cannot be fine tuned using a laptop and lacks any kind of idle compensation for A/C or a Park/Neutral switch. I have to idle it higher than necessary to keep it running...
Forum: TPI
04-20-2024, 06:45 PM
Replies: 296
Views: 7,700
Posted By Fast355

Re: My custom ported H/C/I L98 refresh thread

It definitely has some quirks I am not a fan of though.
Forum: TPI
04-20-2024, 05:58 PM
Replies: 296
Views: 7,700
Posted By Fast355

Re: My custom ported H/C/I L98 refresh thread

I re-snugged the header bolts again today and ran it for a while again today. Weather is not cooperating for a longer test drive as it has been raining more than 12 hours now. The PF4s ECM is...
Forum: TPI
04-20-2024, 02:14 PM
Replies: 296
Views: 7,700
Posted By Fast355

Re: My custom ported H/C/I L98 refresh thread

Alot of stuff in play for sure in exhaust systems. It is definitely scavenging better because headers and a full exhaust system increased the idle vacuum over 1 in/hg. IIRC I saw similar idle vacuum...
Forum: TPI
04-20-2024, 02:01 PM
Replies: 296
Views: 7,700
Posted By Fast355

Re: My custom ported H/C/I L98 refresh thread

I will admit the system now removing fuel especially at idle and lower rpm is weird but it is what it is doing and it is definitely making more torque. It is pulling more vacuum at idle too. It was...
Forum: TPI
04-20-2024, 05:45 AM
Replies: 296
Views: 7,700
Posted By Fast355

Re: My custom ported H/C/I L98 refresh thread

This was the biggest surprise though after installing those headers and building that exhaust. As the engine warms up fully and the IATs start to creep up the injector pulsewidth (labeled Injection)...
Forum: TPI
04-20-2024, 04:44 AM
Replies: 296
Views: 7,700
Posted By Fast355

Re: My custom ported H/C/I L98 refresh thread

I completely get that. I had to create a custom setup and the only headers on the market for a G-van now are Hedmans as Hooker has dropped their offering as well. I finished up the Thorley header...
Forum: TPI
04-20-2024, 04:32 AM
Replies: 296
Views: 7,700
Posted By Fast355

Re: My custom ported H/C/I L98 refresh thread

I will not knock your head choice, but I have used Nissan Blue coolant in everything for over a decade now. Even stuff that sits around is as clean as new. With all the aluminum in the manifold and...
Forum: TPI
04-19-2024, 12:44 PM
Replies: 296
Views: 7,700
Posted By Fast355

Re: My custom ported H/C/I L98 refresh thread

I think the exhaust plays a big part as well. I am able to get a lot better exhaust on the engines I run than a typical 3rd Gen due to the chassis i run them in. My old 350 Vortec TPI carried power...
Forum: Cooling
04-15-2024, 02:45 AM
Replies: 18
Views: 758
Posted By Fast355

Re: GM R12 AC system rebuild

My wiring no longer feeds off a 10 awg off the starter with the tiny undersized junction post typical of GMs of the era. It has a 6 awg feed off the battery and matching size charge wire off the 145a...
Forum: Cooling
04-15-2024, 02:22 AM
Replies: 18
Views: 758
Posted By Fast355

Re: GM R12 AC system rebuild

Yea its getting warm down here especially in the afternoons. Snowed a couple of days while I was in Pagosa Springs last month. Was a fun trip.

Here is our forcast this week. One of the reasons I...
Forum: Tech / General Engine
04-14-2024, 12:40 PM
Replies: 4
Views: 186
Posted By Fast355

Re: L31 blowing smoke

I would start with some more run time and then a leakdown test. Rings need cylinder pressure and heat to seat and seal up. Not full boost or anything, but just some good heavy part throttle...
Forum: Cooling
04-11-2024, 11:36 PM
Replies: 12
Views: 308
Posted By Fast355

Re: Compressor hoses

Recently bought one myself. There are multiple GM ac manifold replacement options to custom fabricate hoses.
Forum: Cooling
04-11-2024, 07:02 PM
Replies: 18
Views: 758
Posted By Fast355

Re: GM R12 AC system rebuild

I finished this project a while back. Even with the engine cover off, the ac gets very cold. It was about 85-90F when I charged it. With the engine at 2,000 rpm it got down to 29F out of the center...
Forum: TPI
04-10-2024, 07:14 PM
Replies: 296
Views: 7,700
Posted By Fast355

Re: My custom ported H/C/I L98 refresh thread

I have had very good results with Vibrant Merge-Ys when forced to run a single exhaust. It is hard to get a good dual exhaust on a 4x4 truck or Tahoe for example.
Forum: TPI
04-10-2024, 06:55 PM
Replies: 296
Views: 7,700
Posted By Fast355

Re: My custom ported H/C/I L98 refresh thread

I will add to this, wave tuning starts at the atmospheres inlet to the air box and stops at the exhaust opening to the atmosphere. If you looks at the air inlets to the air filter assembly on many...
Forum: TPI
04-09-2024, 05:07 PM
Replies: 296
Views: 7,700
Posted By Fast355

Re: My custom ported H/C/I L98 refresh thread

The lower manifold base has 8 individual runners and is thus an extension of each runner. The interesting part to me is just the base runner length stops making power at ~5,500 rpm. Also found it...
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