I plan on installing a procharger D1sc kit on my 383 TPI in the near future but would like to have everything planned out exactly before I make the purchase. My current set up is in my sig. I have a couple questions I would like help with before I go any futher. First off, I am at an 11:1 compression ratio right now. To fix that I am going to switch my AFR 195's with 65cc chambers to the AFR 195's with a 75cc chamber. That should bring the compression down to around 10:1 or 9.5:1 approximatly I believe. I will be running an intercooler as well. The intake is already heavily ported and I am keeping the same cam in it as well. After all is done I don't plan on running any more than 8 or 10 pounds of boost. Some questions that I have are

1. Along with the drop in compression and running an intercooler should I be alright with 93 octane fuel or should I use a water injection kit as well?
2. Should I stick with the 3 core intercooler that comes with the D1sc kit or is there another model that would be better?
3. I hear people say to ditch the FMU and get it dyno tuned? Why is that?
4. Will the current bosch III 30lb/hr injectors work or will they need an upgrade?
5. Should I keep the factory 165 MAF ecm and get it tuned or go with an aftermarket ECM? If so what kind?
6. What fuel pump should I use?

I am sure I will think of more questions, but answers to those will be very helpful for now.

 

Anybody on here with a procharger on a TPI that can help out?

 

Compression will be fine with 8-10 lbs on 93 oct only. I wouldnt stress more without meth/water injections. Wont need it with the intercooler for that low boost but its always a safe idea to include it. Just be aware your ring gaps probably are alittle tighter than what would be recommended for a boosted motor but should be ok with a safer tune. Run a step colder plug than whats in it now. Should be around 2 steps colder atleast.

The procharger 3 core should be fine, but you can always go with a large front mount intake if you wanted. Ebay has some cheap ones that work pretty well for what they are, or you can invest in a better one. Probably wont be needed.

You can control it with an FMU but its a bandaid way to tune. You are just jacking up fuel pressure to high levels and its harder on the pump. Actually you may not have enough fuel pump to allow for an FMU to work for the power level you may reach. It will be close IMO. May need dual pumps.
Proper fuel control should be from a 2-3 bar based MAP sensor. Not many options available for stock TPI based ecm systems. You would have to convert to 730 speed density ECM, repin the MAF harness for it and add the 2 bar map sensor. Run code $59 in the chip tune.

Or run an aftermarket EFI system. Not as cost effective tho.

Or an option you could try is Blowerworks MAF upgrade. Stock MAF will NOT work. They have a custom chip tune calibration for a larger style MAF that can read up to 600-700 hp. Thats about where you will be. 600 Hp shouldnt be a problem with that cam, those heads, that compression and 10 psi boost.

A single walbro with hot wire kit on alternator should do 550whp, maybe tad more. That should cover your goals but be very close to the limit.

You will want atleast 42lb injectors, preferably 60lb for room and you may find the siemens 60's cheaper as they are very very popular. If you ran FMU, 30's I'm not sure will work without a large fuel pressure rise. May still need 42's. That will help keep the fuel pressure rise per psi boost down in the FMU. Should keep overall fuel pressure down and keep pump happy

 

I have a 89 GTA and I have a 383 forged rotating kit set for 8.3 compression. I also have a d1 procharger. I wanted to know what size injectors should I go with and how much boost should I push to make a 800 HP motor. I was thinking 22 psi and 80lb injectors from what a friend told me. What you think? Along with Holley Ram Intake what system do I use to run it? What will read up to that much power?

 

What heads? What cam? 80lb injector is what you will need and a good fuel pump setup. If in tank, need dual pumps

 

I was thinking 210 AFR's and unsure of what cam to get yet. Any good suggestions?

 

Those heads i would rather see 9 to 1 comp but it wont have a problem making 800 hp. Figure around 16-17psi with a decent 230 deg blower cam.

 

Thanks for all the help so far.
I will stick with the 3 core intercooler from procharger then. I will skip going the FMU route and just get a good dyno tune on it.

I only found the Bosch III's up to 42lbs. If going up to 60lb injectors isn't going to be overkill, I will do it. Are siemens a very good injector or is there another model out there that performs better?

Would it be easier to repin my MAF harness or just install a 730 ecm and a new harness together? Is the 2 bar map sensor the same map sensor that all factory speed density set ups run? How would I "run" code $59 in the chip tune?

Im not sure on exactly which fuel pump fuel pump I should use. Would this model work? http://www.summitracing.com/parts/vp...maro/year/1985

 

Thank you and
230 deg as in the lobe duration? I don't know much about cams I have a friend that's going to help me with the build but I'm trying to get the parts together.

 

Well code $59 is an operating mask you load into the ecm chip. Theres a bin file that you actually load but operating mask is what is used to program and read the bin files. Code59.org is where alot of good info is.

Problem is not many know how to use it and finding a tuner would be more difficult. Unless you can do it yourself it may not be a good option.

If you did this i would repin your maf harness and then buy 730 ecm and stock prom, for use with chip adapter. Buy a 3 bar map or 2 bar as code $59 should support a 2 bar now i am not sure. 3 bar would work. Just gotta add it to the ecm.

Megasquirt is popular, fairly cheap and likely a better bet for tuneability. Hear its a breeze to use. Others can comment on that as i have never used it

42's are good to 550 whp just about. Maybe more maybe less depending on pressure. 60's can do 700 hp. Not over kill if only using them for 400-500. They work fine at smaller hp levels. Dont have to be bosch 3's. the siemens ones are proven and great injectors

Single factory style efi in tank pump known as a walbro 255 lph will support 550 hp and thats about all unless boost a pump voltage multiplier is added. Dual pumps will do 1000. Or a big external like a A1000 would hold 800 hp, but need a sump

 

Yeah try to keep it a hyd roller if possible and 230 deg at .050" lifter lift. Advertised is around 280-290. Best to talk to a custom cam grinder. Blower typically wants 6-15 deg spread depending on the exhaust side and a wider lsa although some overlap for blow down cooling is prefered on more wild setups

 

So I would load the code $59 into the chip as a good starting point and then have it dyno tuned?

 

You will have to setup the file for a v8 and get it running close before is dyno tuneable. Its not an easy burn a chip and drive thing unless you have good tuning background.

Nothing in efi is really easy when starting from scratch. Always need a base file to work with. An aftermarket setup may be worthwhile due to popularity and more available tuners

 

So what aftermarket ecm's would be a good choice to use? Do they come complete with a harness and all for a tpi set up?
I was looking around and found this fuel pump. How would this work for my set up?

http://www.jegs.com/i/Aeromotive/027/11101/10002/-1