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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars |
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09-11-2013, 07:59 PM | #3451 | |
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after getting fuel pump rewired, i took the car back out yesterday and it felt better. AFRs are richer in boost and whatnot. i think that was probably the main issue. thanks for the input!
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09-11-2013, 08:56 PM | #3452 | ||||
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09-11-2013, 11:26 PM | #3453 | |
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09-11-2013, 11:30 PM | #3454 |
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you may find that if you do that, you may actually lose power. water , meth, and even 100 octane gas, burn slower, which makes the engine lose power unless the ignition is advance to compensate for it. the only reason to run water meth is to allow your engine to run where it couldnt before. for example using 95 octane gas we couldnt run more than 1 bar, the ignition would have to be retarded so much to prevent knock, that the car was not performing as it should. thats where water meth comes into play. i can't wait to get finished with the rest of the car so i can get on water meth tuning...
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09-12-2013, 01:21 AM | #3455 | |
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09-13-2013, 05:25 AM | #3458 |
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wrong thread my bad!
But i have a staggered cam setup didn't need any tweaking with the greedy easy cams! The tuning of water injection from from my experience is much like cody describes it, I haven't tuned a water setup to be used for power but for detonation resistance. If the tune is good adding meth, helps keep the intake temps low, we're just cooling the charge. The effects are the same, meaning 20deg up top doesn't get pulled to soon. All on top of an 11.8 -11.5 afr Which should be safe without meth.
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09-14-2013, 11:32 AM | #3459 |
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ill trust your guys' word on the staggered cams. i think it only had benefits on the vr6's because its a staggered inline design.
hey cody, got any dyno numbers with the new GTX? |
09-14-2013, 11:37 AM | #3460 | |
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09-22-2013, 12:15 PM | #3461 |
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Just wondering if I run HKS Step 2 Cams 264 duration with 11.5mm lift, will BC valvesprings and retainers be compatible/ drop in or will they need modifications ? Also, with a stock bottom end, should I go with a stock thickness aftermarket headgasket ?
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09-24-2013, 04:08 PM | #3463 |
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The Kelford cams are a staggered set. Probably the only ones I would consider to the JWTs.
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09-24-2013, 08:15 PM | #3464 |
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Sooo I think this is the first time I've posted in this thread.. Long story short I spun a bearing in my stock SR and bought a bottom end with a crack in one of the sleeves that had weisco 9:1 pistons and eagle rods. I'm about to order tomei 260 procams (I have bc valvesprings) because my stock cams are scored to hell and some kind of 550cc injectors. My goal for this motor is 350whp with a rs enthalpy tune. Is this doable with a s15 t28 or would I need to step up to a 2871 or 2867. I pretty much want a setup that will spool as quickly as possible and wont run out of breath by 8k.
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09-24-2013, 09:03 PM | #3465 | |
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Also 260 cams would not be a good choice for a 300hp turbo.
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98 240sx w/ S15 SR20DET, T2 20g, 11.22 @ 124.98 |
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09-24-2013, 09:34 PM | #3466 |
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You are going to fight to get the T28 above the 300 mark. GT2860RS will probably peak close to there. GTX2863R Should get you there easy. 2871/2867 no problem.
That's more cam than the T28 will ever use. Considering the investment I would go with the GTX wheels now.
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09-25-2013, 12:26 PM | #3467 | ||
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09-25-2013, 12:44 PM | #3469 |
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A S15 turbo will run out of steam by 7k rpms and will max out in the low 300hp range regardless on the cams and has nothing to do with the bottom end.
I can run my boost controller on 100% and the turbo will will not make more than 20psi. Typically hits 20.5psi and bleeds of to 18 by redline and I have a S15 spec r T28. Can wait to get a 20g on this thing.
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98 240sx w/ S15 SR20DET, T2 20g, 11.22 @ 124.98 |
09-25-2013, 12:58 PM | #3470 | ||
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Also, just in case someone says my bottom end or these cams is way overkill... I got the bottom end plus bc valve springs, arp headstuds, new oil pump, eagle rods and wiesco 9:1 pistons for a steal. And I'd be keeping stock cams if mine weren't scored to hell from my squirters being all clogged. A bulletproof low-to-mid 300 sr is really what I'm going for here. Thanks for all the advice and non-flaming by the way hah
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09-25-2013, 01:26 PM | #3471 |
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Not sure what your not understanding. If you want to make power past 7k the T28 is the wrong turbo. To stay in its power band you will be shifting around 7k rpms.
Why are you so set on reving to 8k? To my understanding from someone who tunes 100's of these cars. Exceeding 300hp on. T28 is not the norm. High 200's is far more common. On a perfect set up and a generous dyno 320-330 has been seen. Of coarse dyno numbers with out a trap speed at the track don't always mean a lot.
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98 240sx w/ S15 SR20DET, T2 20g, 11.22 @ 124.98 |
09-25-2013, 01:35 PM | #3472 | |
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Don't need to worry about the bottom end at those levels. The cams will shift the powerband higher in the RPM range. I don't know if you would be happy with the lag. If you have the T28 already. Bolt it up and try(max) it out. If you are buying a turbo get a GTX. The only thing I would worry about is that your goals are at or above the theoretical limit of 550cc injectors.
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09-25-2013, 08:42 PM | #3473 | |||
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Not on same dyno as it's changed owners1
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BC sucks big time. Get the HL JWT cams.. Quote:
550cc of fuel is good for 375whp. Go with a 28rs. Quote:
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09-25-2013, 09:14 PM | #3474 |
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I can honestly say that my S15 T28 runs out of breath after 7k you can see it in the boost gauge and feel it seat of pants. On throttle snap is awesome, but I'm going GTX2867R this winter
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09-25-2013, 11:15 PM | #3475 |
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personally i dont like high rpm limits... they sound good over two cups of coffee, but the strain on the engine is exponential... too much stress and risk for a street car.
i haven't ran the 2871 in high boost yet, only up to 0.7 bar, but compared to the 2860rs, i liked the instant power of the 2860... now if the new GTX's are a bit more than the old 2860 it sounds perfect. but they are so damn expensive... i bought the 71 for 820 euros, and the same turbo in GTX was over 1200e... |
09-25-2013, 11:42 PM | #3476 |
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09-26-2013, 06:41 PM | #3477 |
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I have seen Brian Crower 264's go into several SR20 engines. All of them are working well. The idle is nearly stock if not completely stock sounding. They are well behaved. And they will give you a flat VE anywhere from 3800~rpm to 7500rpm~.
You cant ask for more? Okay, You can. S3's go into these engines on OEM valvesprings and do the same exact thing. They are slightly less lift of course, which is a good thing for a daily driver. It might mean slightly less VE but... well worth the trade if you can keep a stock spring. |
09-26-2013, 06:57 PM | #3478 | |
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i just switched from a DBB S15 T28 to a 2871R. the s15 turbo was quicker getting in to boost, but dear jeebus the 2871 has gobs more top end.
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09-27-2013, 12:39 AM | #3479 | ||
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Awesome, that's what I was thinking about injectors... I never heard of needing 720cc for 350 hp. Also, 28rs is a straight bolt on affair correct? Same intake and hotpipe size?
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2871r and s15/s15 bb t28 is what I'm debating between. If I can find a used 2871r for around 6-700 I'll probably run that though. What all is needed to run one though? (Intake setups and hotpipe size). I would probably go z32 maf as well...
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09-27-2013, 01:46 AM | #3480 | |
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