how much boost can i run on stock bb det, with stock maf and 370 inj. on race gas? i now have full 2 1/2 turbo back exhaust, and a boost controller is on the way.

Brian

i was just wondering where you got your testpipe from. I made my own awhile back but need a bigger one for turbo and was just wondering how yours came out and where you got it from. thanks

From what I understand the T25 is the weak point of the set-up. I run about 12-13 psi at the track, that is about all the T25 can handle, plus the T25 starts to fall on its face after that. I have known a few people that have run 15-16 psi, one blew his engine and the turbo died, another guys turbo died and the last guy had success with it. At 12-13 psi I run 93 octane fuel with no signs of detonation. I don't think you need to run race fuel, If I were you I would boost about 12-13 psi at the track only, some might say 10 psi, just make sure you have upgraded your fuel pump if you are turning up the boost.

Originally posted by 91sentra_se-r
i was just wondering where you got your testpipe from. I made my own awhile back but need a bigger one for turbo and was just wondering how yours came out and where you got it from. thanks

If you need a very high quality test pipe fabbed, I can help you. Here are the specs:

2.5" or 3"
1/2" thick laser cut flanges
stainless steel hardware
fully ceramic coated
with or without rear O2 bung
fully TIG welded

Both sizes will bolt right up to your existing downpipe/exhaust with no modification necessary.

They sell for $120 shipped and turn around time is 2.5 weeks.

Let me know if you are interested. I also have digitals pics of previous test pipes I have made for my customers.

Later,

2.5 weeks? no sooner? what about a 60mm(2.375in) test pipe?
And can you send me pics to civicdragon@comcast.net

When boosting high on a t25, the turbo is the least amount of your worries. Somewhere around 14-15 psi, you start topping out the MAF, which will cause the motor to run lean and blow up. At that psi, I think you're actually past the limits of the stock fuel pump which will cause the motor to run lean and blow up. Boosting the t25 to 15 psi just puts it beyond its highest efficency and will also cause the turbo to die faster (but at least you won't blow the motor). Race gas or not, I wouldn't boost past 12 at the upper limit. Race gas just helps to prevent detonation due to increased temps(pretty sure); doesn't help if you can't get enough fuel in there. I'm sticking to 10 psi until I can get a bigger fuel pump and then I'd probably just boost 12psi.

Khiem

i was just wondering if i could see some pics of the testpipe 3 inch if you have any thanks either here or send them to jrg_mkl@yahoo.com also, if i have a jwt ecu 370 and walbro 250 fuel pump stock maf and de i can run 10 pds. safely at the track, without problems. anyone run this much around the street with this setup or not a good idea let me know thanks

it's a t25 turbo sorry about that

Like I said above, 10 psi is fairly safe even with the stock fuel pump. Since you're running the big fuel pump, it's no prob. The next barrier to you making more power is the stock MAF. Keep an eye on your maf voltage and don't boost any higher than what will top out the maf. You can do a search under maf voltage, turbos, etc. in the se-r.net archives. I would stick to stock boost though for everyday driving to preserve the life of the turbo. I only turn on the boost controller when some pesky ricer bugs me :)

Khiem

i have a t25, stock maf and 370 inj, warlboro 255 hp puel pump, stock tmic, 2 1/2 turbo back. what can i expect at the track on 10-12 psi with race fuel, if i boost any higher than stock, race fuel will be added for safety. my best to date on stock boost is 14.2, so at 10-12, i should be in the 13's, i hope.

Brian

thankyou can't wait to turn it up for those pesky ricers haha

i have a nx that is pretty much the same set up, and i boosting 10 pounds stock. but i also upgraded my fuel pump with a walboro 255 fuel pump and you can feel a difference, between a stock fuel pump. alot of times you dont even hit 10pounds, when driving regularly, unless you like to slam on the gas pedal hard. oh, also look at ebay, under sentra, there is a guy who has custom test pipes up for bet.if you win you can get a choice of 21/5 or 3in, i think, i don't remember. i won it for $35. and it is a direct bolt on from your stock cat. it is made of steel and comes with all the gasket and bolts. take a look and good luck. :D

hey thanks alot i checked it out. I plan on getting one but need to know if it's a 3inch or if i can get one wrote them and email hope to here back soon. Have you ran your car at the track with your setup? if so howd you do? thanks again. later

Tuned,
We're in the same boat....car....what we (you) need is cams. S4s will put you in the mid 13s @ 12psi.
Cheers,
Charlie :)

how much are s4's? i dont know to much about cams, so i thought i would ask.winter plans include a ttz maf and 50lb injectors. maybe a t28? im thinking with 10-12 psi, i should be able to at least break the 13's.

Brian

Originally posted by TUNED200
how much are s4's? i dont know to much about cams, so i thought i would ask.winter plans include a ttz maf and 50lb injectors. maybe a t28? im thinking with 10-12 psi, i should be able to at least break the 13's.

Brian

Add some pulleys and a 3inch exhaust...

S4's are from 500-600 depending on where you get them from

wondering where some places to buy s3 or s4's are the best most inexpensive place

i have not timed my car yet, but just to remind you need to get a good tires and suspension setup too, because the more boost, the less traction you are gonna have. i sometimes have alot of tire spin. but as for the s4 cams, you do not need them unless you are running great amount of hp- 300hp and up. but if you do want them, look around first because some one is always selling themand you can get a better deal.:D

Originally posted by nxgoody2000
but as for the s4 cams, you do not need them unless you are running great amount of hp- 300hp and up.

Not really true, you can get good gains from S4's in any turbo setup T28 or larger... I've done some research and S3's and S4's both give good gains...

Cams help a lot with turbos.... I have S3's with my t25 and it's great. From what I've read, most guys with t25s have the power start to fall off after 5.5k rpm. With the cams, it keeps pulling until around 7k rpm.

And the S3's gave around 12-whp when NA. It'll give a bigger advantage wiht turbos, even with just a t25. I think I remember someone gaining 40-50 whp with either s3s or s4s when running a t3/t4 hybrid or something.

As for turbo setups, if you're running a t28, you better step up to the 50lbs injectors and Cobra Maf. Greg Perry just posted that he had the 370cc at 100% duty cycle at just ~10psi on the t28 and was also hitting 5.01V on the MAF which is basically topping that out too. Now you add cams on top of that..... well, you get the idea.

Khiem