Maxed out 370cc inj. at stock Boost!

MarkSR20 · Sep 17th, 2002, 04:59 PM

Well I have come to the conclusion that I am maxing out my injectors. I put down 246.9whp and 212.0 ft.lbs. on a stock pulsar t28 at 7psi. This is with 370cc injectors. I have a bored Stock maf with a 3bar JWT ECU program. I dont know where to begin. I dont want to go with 50lb. injectors just yet. I am waiting for the winter! What do I do for the time being??? Thanks and have a good one!

Sep 18th, 2002, 03:21 PM

247 wheel HP on a stock t28 at 7 psi? Does not compute... warning... danger to manifold...

I don't know how the hell you got 247 wheel Hp out of a stock DET at stock boost that makes 230 crank HP. But in any case, yes 250 HP is about the limit for 370cc injectors. A stock DET at stock boost shouldn't be doing more than 210 wheel HP, so normally it wouldn't be an issue. What's up with that?

MarkSR20 · Sep 18th, 2002, 08:44 PM

LOL,
This is on a Stock US SR20DE! I dont know if that makes the difference more understanding or more of a wondering? I definitly have to do something about it. Any input on how to cure this please let me know! Thanks

boost_boy · Sep 19th, 2002, 04:20 PM

With the compression of a stock SR20 and a JWT ECU, I can guarantee you're starting to trigger that knock sensor. I would say "Becareful". You seem like you want more boost, so why don't you just decompress the engine with lower compression pistons or a thicker headgasket. Sounds like you're rolling around with a time-bomb.

MarkSR20 · Sep 20th, 2002, 10:47 AM

I was looking to go that route also! But wouldnt bigger injectors and Cobra MAF and JWT ECU Reprogramming with water injection do the same thing? I am just looking to figure out options! Thanks for your reply!

TUNED200 · Sep 20th, 2002, 10:54 AM

Quote:

Originally posted by MarkSR20
I was looking to go that route also! But wouldnt bigger injectors and Cobra MAF and JWT ECU Reprogramming with water injection do the same thing? I am just looking to figure out options! Thanks for your reply!

im not fond of the cobra maf, get the ttz maf.
get the jwt ecu, it rocks
i wouldnt mess with water injection either

check out www.sr20deforum.com look in the racing section. there is a guy with a t28 on a usdm sr20 with 151K+ miles on it running low 13's. he is topped out at 9.75psi on 370's.

Brian

Oct 4th, 2002, 02:09 PM

Yes, he is making that kind of power on 7psi. Mark is a personal friend of mine.

Mark you got two band aid choices IMO until you can do it right.

1. Raise the fuel pressure. You can get a 370 to flow closer to a 450-500cc with more fuel pressure. Yes it will run fat across the band, but it's better than a melted piston.

2. Water injection. This SHOULD keep you happy as long as you don't go beyond where you are.

W10DET2020 · Oct 14th, 2002, 02:27 AM

Here a quick fix to your problem make the stock FPR adjustable.

Note: You can only raise fuel pressure this way not lower it, I know your trying to raise fuel pressure though.

Boosterwitch · Oct 14th, 2002, 01:05 PM

You should go with the Cobra MAF, H20 injection, 50lb injectors, and JWT ECU.

It's definitely added safety having the water. And as Jay knows, that combination is capable of over 400whp

MarkSR20 · Oct 15th, 2002, 02:54 PM

ryan: is your car the first to have the Fmax kit??? If so, how many miles are on your car now?

I have been talking to a lot of people about the water injection and it seems like a no brainer. But to have the water injection and the JWT ECU programmed for it, it seems like an expensive setup? I am not sure on the price but if anyone has that info(retail) that would be great.

I spoke with someone not running water injection at high boost and he said that he does not recommend it but it is something that can be done(with race gas). I plan on driving it daily and getting the most out of the car (longevity wise) so it looks like I will be doing this upgrade soon! Have a good one!

Oct 15th, 2002, 08:09 PM

Why would somebody not recommend water injection? I mean it's not really any different than Subaru or Mitsubishi using intercooler sprayers, and the results are essentially the same - cooler, denser intake charge which will allow you to ramp up the boost a few psi without changing anything else.

And using race gas or not has nothing to do with it really, it will cool your intake charge whether you're using race gas or not. I see using water injection on a stock motor (with a turbo kit) on pump gas as a safety margin - lets you crank up the boost a bit, and cools your combustion temps a bit more if you leave your boost where it is. Can be very handy for those of us in warmer climates.

Boosterwitch · Oct 15th, 2002, 08:38 PM

Quote:

Originally posted by MarkSR20
ryan: is your car the first to have the Fmax kit??? If so, how many miles are on your car now?

Yes. It has over 100k miles on it, although it's been down for sometime.

If you inject water without changing anything else you would lose power. So it's important to have engine management to advance timing and/or change the fuel curve.

On my 392whp run I did have the water on with c16.

MarkSR20 · Oct 15th, 2002, 08:49 PM

Zak: read the post a little closer. I am not saying that he doesnt recommend using water. I put that he doesnt recommend not using water at high boost levels! And I thought that was you Ryan, how is the car treating you? Hope all is well and thanks for all the info!

Oct 16th, 2002, 02:18 AM

Ah, I get it. You got me with the double negatives.

MarkSR20 · Oct 16th, 2002, 08:15 AM

Yeah sorry about that! Well it looks like the winter is going to be project city. With a low budget and new technology, it looks like things are going to be interesting to say the least. I will definitly keep everyone updated! Have a good one!