Well, This is my first post guys. Im terribly sorry if this is a noob question but I searched but I may not be famarilar with this site enough so please bare with me. I purchesed a highly modified s13, from jgy:(

It was still worth it although it blew up cylender 3 in a week and a half (causing massive blow by although it was still terribly fast afterwords.) Turns out it was caused by too lean of a mixture due to the nismo fpr not being high enough. I should have done some homework on the jwt ecu and the nismo fpr before driving it but the motor is being built right now.

Anyways im goning to list my mods.
Greddy rocker arm stoppers
jwt ecu
z32 afm
255lpr fp
72# injectors
jgy fuel rail
jgy fly wheel
6 puck cc
greddy intercooler and pipes
turbo xs bov
greddy oil pan
whiteline swaybars
tien lowering springs
gt2871r turbo
greddy intake manifold
hks filter
topspeed (i believe) turbo hedder
greddy or top speed j pipe (cant remember)
greddy down pipe
greddy cat back
jgy test pipe
greddy wide band
greddy fp gage
greddy boost gauge
greddy turbo timer
greddy profec b


Now the engine is getting torn down and its getting cp pistons at 9:1 compression. The motor is being bored .20 over and the stock rods are going to be used. Im getting new berings ovcourse, and a cometic metal head gasket.

Now my question is, what boost is going to be safe for the engine to run on? 16 is as low as I can turn it down for some reason but 28 is what blew the motor but that was probably because the afr was at like 15:rolleyes:
Help me out guys

let me guess, tl;dr?

ok, a sr20det with a turbo that can output over 2 bar and can keep up with fuel no problem. The compression is 9:1 and its using stock rods. How much boost can I put through it?

Should I put this in a different section?

To tell you the truth 4x4le i would try www.240sxforums.com - personally im selling my nx because i bought a s13 and it has a ka24de so i usually hit up 240sxforums.com website for info on that. This forum doesn't have much on the 240 for information as some other forums do.

Just my opinion is all.

Well thanks, I might look around there a little but I seen a bunch of people seem to know allot about sr20det's here. I was hoping someone could give me a decent ballpark. Im looking for up to 25psi hopefully as an answer but if people tell me 20 ill be content. Im just hoping someone could give me an answer.

I was hoping I didnt break any rules or anything. Im a member of a few different forums (non car related) and a mod on 1 and they are all so different and I know how quickly people can get annoyed so Im always so nervous when I join a new one until I see the way things go.
Was it ok for me to ask in here?

Im pretty sure it can handle up to 2 bar, but the only way to be 100% sure would be to dyno it. A couple of my friends who have SRs w/t28 boost around 20psi.

one of my friends is putting out 412 or so at 19 lbs.
hes got cp pistons, stock rods and a jwt tune.

see, I blew the rings on cyl 3 due to lean conditions. The motor is being rebuilt right now and im going 9:1. I dont thing it had so much to do with the boost being too high but rather it was lean and Im on top of that one for now on. Sr-noob mistake......

2 bar is closer to 30# 93 sentra, or was that a typo?
I dunno, I guess after I get it broken in Ill take it to a dyno and see what it takes to hit 400hp and leave that for my high boost setting.

Typo, sorry I didnt catch it. I was trying to say that it should be able to handle 1 bar safely.

dang, I would hope it could handle lots more than 1 bar! I can only have it set as low as 1.125ish like 16 psi.

oh well, its going to the dyno when I get it back and broken in.

Whats up,

1) First of all 28psi on almost any motor on pump gas is detonation city which is quick death for your motor. On pump 18 psi or lower for relatively safe operation, 20 psi limit with a chance of kaboom!

2) If you are using race gas and a rom tune you need to make sure the tune supports race gas and those high levels of boost. Most street tunes support moderate boost and mild octane race gas.

3) One of the weakest known OEM RWD SR parts is the rods, the casting process from factory was inconsistant in the early model SR's which is why some motors are weaker than others and why i recomend you upgrade them also.

4) Lastly, depending on the trim the 2871R @ 28psi is past its efficiency range and pretty much blowing alot of hot air for little or know performance gain which in turns adds to the detonation problems.

Hope this helps, and build it right the first time it will save you time and money in the long run. Also im taking the time to help because i remember when i first got into SR's alot of people where di@Ks, however please do some better searching and if you really, really cant find what you need then ask and this forum (though small) has some of the coolest and most helpful people.
Laz.

Like the guy above me said. Pretty much a turbo newb mistake. Im not flamming but too much boost makes lean conditions. and 28#'s of boost means really really high compression which in turn means you need high octane gas or kiss your motor good bye... again. Im sure JGY had the FPR set right where the ECU needed it to to run correctly. Im betting they didn't build it for 28 psi, thats outta the range for the 2871r like said above. JGY isn't stupid, they're just shaddy at times. But other than that if you can keep the car from being boost happy you'll have a lot of fun in the future.

What part of TN are you at?

Seeing as were on the subject of handeling boost, this wont be an off question. I am having a det swap done this week to my s14. What is the recommneded boost pressure to run with the stock internals and stock turbo? Also any reccomendations for electronic boost controllers would be helpful. A friend of mine said the stock turbo will fall flat on its face at 14psi, is this true?

14psi always felt nice to me ???? stock t25. it still falls on its face up after 6500 rpm but is fun getting there.

I think he said that the blacktop came with a t28. I dont exactly remember. Im new to the turbo thing. very excited but new. So 14 psi is fine on the stock blacktop? Reliably?

S13 or S14 engine?

I wouldn't go past 12 on a T25, which all S13 engines had.

EDIT: meant T25, not T28.

never heard about a stock JDM s13 with a t28. thought that was s14 and up.

wow, for some reason yesterdays post was the only one that gave me a notification, so I just assumed this thread was dead. I didnt know I got any replys since my last post. anyways thanks for hyjacking because now I know people didn't forget about me.

Anyways, Yea, I know it was a noob turbo mistake. I do however feel that JGY did have the fpr too low because at all rpm levels and all boost levels it always read lean. It might shoot up to 13:1 when I stepped on it but that lasted for 1/2 a second and then went lean again. It would also go way rich when I let off the gas but that was just because of the bov. They only had it set at like 2bar on the fuel pressure at idle. I really don't like JGY at all anymore either. I know they don't know their stuff because they are the ones that told me it was ok to run 28psi. They told me I could actually go all the way to 30 but there wouldn't be much difference between 28 and 30 so just leave it at 28. For real, jgy really had told me some stories that I found out wernt true and bla bla but I guess they really thought I would never know better. It sucks for them because I would have really been a good customer. I honestly got a steal on the car even considering I'm having a shop (who now sponcers me because im going to be competing in the drifting at Nashville super speedway and some auto-x's when I can.) here completely take it apart and do everything right this time. I'm also having them build the motor. I didn't re read any of my first posts so I don't know if im being redundant but I know a few things have changed in how the build of the engine is going.
I'm getting arp head studs, cometic head gasket, the next size up from stock (i cant remember what exact size right now) cp pistons and they are 9:1 compression, eagle rods, and new Nissan bearings. All the gaskets are being replaced also.

my ecu is a jim wolf and my shop is actually calling them and seeing what they recommend as far as max boost and what fuel to run so I don't run into further problems. Im not to consirned with how much power I can make, but rather how much reliable power I can safely make with this setup.

I did really search and I couldn't find anything that would help me btw. Also Im In Manchester Tn but I wouldn't mind driving to Nashville to show a fellow member my car and take a peak at yours in the future.

Oh and thanks again for the replys and sorry about not checking in, I didn't get any e-mail notifications until today.

Oh, and sorry if my spelling and grammar is bad, I'm drunk right now.

Edited above.

Sorry guys I guess I wasnt specific enough. I was asking about an S14 Sr20.