How much boost could I safely run on my setup?

[dhen]

I've been doing a lot of reading. In the FAQs section, it says you can run 10 psi with the stock intercooler and 12psi of boost on the stock fuel system. My system has a couple of mods, and I was wondering how much boost I would be able to run.

Here's my setup:

* Supertech forged pistons (83.5 mm.)* stock ECU* VPC piggyback system (allows me to get rid of the MAF and to adjust the AFR)* Walbro 255 fuel pump* custom intercooler dimensions: 19X6X3 inches* Euro 4-port head (not sure if this part matters, but I thought I'd mention it.)* stock injectors* Greddy BOV* adjustable fuel pressure regulator

Any comments are welcome.

Thanks,

Darian
Modified by dhen at 8:54 PM 9/27/2009

[ca18detgabby]

stock snail?

I would stay near the 10PSI till you start playing more w/ the fuel.

[dhen]

SR20 snail. Isn't that almost the same thing, though?

Thanks,

Darian

[slo]

I bet it all depends on how it's tuned...

[LEE_08]

14-16 psi will be about it, the stock injectors will be close to 100% duty cycle round there, should get you about 200-220hp at the wheels

[float_6969]

The 12psi limit is on the stock CA T25. I would keep it closer to 10psi w/the SR T25. 14-16 is BEGGING for trouble. You don't really have any way to know what duty cycle you're running those injectors at, and you really want to keep them under 80%.

DON'T GET GREEDY! That is how you blow up your motor and end up like half of the other ppl that come in here wanting to push the stock system to the limit. I hate to sound like Dee here, but he's right. DON'T PUSH THE STOCK SYSTEM THAT FAR!

Set it to 10psi, and LEAVE IT THERE, until you get bigger injectors and a wideband.

Or better yet, spend some money on brakes and suspension!

[dhen]

DON'T GET GREEDY!

That's what I was worried about. I'll just leave it at 10 psi.

Thanks,

Darian

[float_6969]

Glad to help, and glad you took my advice. You'll be glad you did.

[dhen]

Bringing this back from the dead, but how much boost do you think I could safely run on the same setup with 450cc injectors? If I recall correctly, 15 PSI would be fine.

Thanks,

Darian

[boost_boy]

Properly tuned, I would not exceed 15psi. Again, that is properly tuned. Even with the bigger injectors, timing is the issue and the stock ecu is still in control of that area which is very critical. Keeping that in mind, if your set-up is not properly tuned and you don't plan on doing it anytime soon, 10psi is the safe point until you get it tuned. Hope you heed the advice because you've worked so hard to get to where you are and I would hate to see you be hard-headed and mess-up something that could set you back.

[dhen]

I didn't realize that tuning would still be an issue. Right now I can't afford a new EMS, so I'll just put it at 10 psi and leave it there.

Thanks for letting me know.

Darian

[mr_ca18det]

Yeah and the stock maf wont like 14-15 psi plus you'll be pushing lots of hot air into the engine so 10 is prob best. someone found that the difference between 10 and 14 was around 5 hp iirc. glad to see she's alive and well.

[float_6969]

As the others have stated, I wouldn't go past 10psi. On that turbo, I think you'll hit the MAFS limit at around 12-13 psi anyway. You've got the fueling to run more boost, but you need other mods to be able to do it.

[D_Stirls]

This is only with regards to turbo efficiency;

CA T25 ~12psi
SR T25G ~14psi
SR T28 (GT2560R) ~17psi

these are roughly the peak efficency's of the turbos. If you push them further they will flow more but the temps of the intake charge will also rise; so it a false economy as you will be making less power per psi for every psi you run above these points (if you get what i mean?).

With regards to the engine, mechanically a CA (even Standard) will take the a fair bit of boost, but the ability of the engine to survive will come down to purely the tune.

[dhen]

OK, I understand better now. It looks like I'd have to get a new engine management system and a tune, which is some serious $$$ that I don't have right now.

Thanks for letting me know.

Darian

[zenyo]

dont mean to thread jack but i cant pm you darian so thought id ask here.
how are you finding the supertech pistons? your the only person iv heard of running them in a ca18det and im thinking about getting a set myself. il be running around 350bhp at the crank with a td05hra 16g turbo.
anyway let me know how your getting along with them, any problems with them so far etc
peace Zen

[dhen]

The Supertech pistons were fine but got destroyed when my timing belt slipped. If you have the original timing belt tensioners and belt, do yourself a favor and swap them out. You don't want to end up like me.

post5303350.html?hilit=dhen%20timing%20belt#p5303350

I have Wiseco pistons now because they were on sale when I bought new ones. Sorry I couldn't be more helpful.

Darian

[zenyo]

Do the wisecos clear the oil squirters? I can get wisecos for a little bit extra and there more well known than supertech. I'm all for trying new products, I just don't want the pistons to be the reason why my motor s*** itself after I spend so much!

[dhen]

I'm using a DE block because my DET block was ruined and I couldn't find a DET block. It's working fine, but it means that I have no oil squirters. The Supertechs clear the oil squirters just fine, though. I was only running 10 psi of boost, so you decide if that's useful to you or not.

By the way, I saw your work on that link you provide on another thread. Very good work! And I love the idea of a CA engine in an e30.

Darian

[dhen]

Don't know how helpful this is, but did you see these threads:

supertech-nissan-ca18det-pistons-t456740.html
http://zilvia.net/f/chat/105652-reliabl ... d-kit.html
http://zilvia.net/f/tech-talk/298066-su ... thers.html

Darian

[zenyo]

Don't know how helpful this is, but did you see these threads:

supertech-nissan-ca18det-pistons-t456740.html
http://zilvia.net/f/chat/105652-reliabl ... d-kit.html
http://zilvia.net/f/tech-talk/298066-su ... thers.html

Darian

cheers mate,
yeah the e30 ca18det build will be pretty cool, plan on just making it a full on drag car and see how fast i can go, seen utes with ca18dets doing 9seconds and thought f*** it might aswell throw it all together start off hitting 12s/13s and slowly over the years improve it untill im breaking the 10second barrier.
and that kit wasnt done by me mate, it was done by another guy off a forum, i was planning on doing the same thing but when i saw his up for sale i thought id save myself the hassle and it worked out alot cheaper. it kinda hurts me to buy someone elses work as i live by the saying built not bought and iv never bought other peoples work before but financialy right now this makes sence. il be upgrading it in the future so no doubt il build something crazier
by using the evo manifold aswell il have a proper twin scroll setup which in theory will help with spool. 300whp is the goal to start with and il go from there