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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars |
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08-27-2011, 10:26 AM | #2133 |
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Would the s3 or s4 cams be a better match for the .86? I am considering the hks 264 step 2's but the jwt cams have such high reviews. But I don't know much about matching them to a turbo.
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08-28-2011, 09:22 AM | #2134 | |
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Yup. Search through this thread I've put up plenty of pictures.
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I think the S3 is the perfect match for the T2 flanged turbos on these engines, and that the S4 area just slightly more to the 'top end' of things, thus being better for the T3 and up turbos. With that said, the S4 on paper would match the compressor housing well in regard to where it should make power, but the S3 better matches the exhaust housing and where it spools/generates torque. With that all considered, I would still suggest the S3 cam instead of the S4, however the S4 will totally work well in these cars, and will still be better suited to a larger turbo if you ever go that way. S3 has more midrange, quicker spool, and great top end, S4 better top end, more peak power, little bit less torque. I'd personally just run the S3 cams, and use a g\reddy intake manifold. Best of both worlds.
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08-28-2011, 04:56 PM | #2135 |
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cody im looking to pick up some throttle response any suggestions? my setup is s3 cams isis intake mani tubular exhaust mani tial v band housing on gt2871 .64 ar. greddy fmic.
I will be switching to a pbm high mount or something like the same idea and i will be switching to bosch ev14 injectors not that it matters. i have a q 45 tb but is there a point with 2.5 inch intercooler piping? |
08-29-2011, 01:31 PM | #2136 |
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Something different.
What volt values (z32 maf) and dutycycle (nismo 740) do you guys see at peakpower? I'm just guestimating mine since being bored haha. I've got 4.54 V and 73% at 20psi @ 7250 rpm. 350 whp area I reckon.
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08-30-2011, 11:16 AM | #2137 | |
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Quote:
The only thing to improve spool would be to use a stock exhaust manifold on that setup, and or (obviously) timing and E85/race fuel. Pump gas wise there isn't much aside from the normal port matching/minor headwork etc etc. FWIW: In order to use those injectors you're going to need to find a way to secure the intake manifold rubber gromets like I did: I'll hafta check my logs, but IIRC it was something in the 4.8 MAF and 90% duty (Cobra Maf/60lb injectors 410whp/20psi JWT tune)
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08-30-2011, 07:56 PM | #2141 |
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So, E85 is plentiful around me, and I've considered switching over to it. What I am wondering is, will 740's be big enough for a basically stock SR with a 2871R turbo? Cause I really don't want to have to buy new ones lol. What about if i added the S3 cams to the mix?
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08-31-2011, 09:10 AM | #2143 | ||
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Quote:
Great Idea! Quote:
So with that said, if your goal is 400 whp, and we'll say that to make 100% duty cycle you would use 580cc injectors. 575ccx 1.30 (30% more) = 748cc of injector....so as TheRealSy pointed out, they would be maxed out at 400ish whp, and you'd be better off going with the next size up.
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08-31-2011, 12:42 PM | #2144 | |
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Quote:
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08-31-2011, 07:49 PM | #2145 |
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its going into the isis manifold so i am going to assume they are shitty if i have to i will have them milled oversize and just pressed in iced and they will stay forever. or if they are useable i will use loctite bearing retainer and press them in.
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09-02-2011, 08:12 AM | #2146 |
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I had bougth STI injectors 520cc, now I just sold em and plan on getting 740cc (since I am running a GT2871R I decided to go 740cc right away instead of 520cc)
Is it worth spending the extra money on a brand name (ie, nismo, tomei, hks) I could probably find a set of used nismo for around 400, but then I would need to clean and flow test and that would bring me to the same amount as buying new ones.. I am debating whether I am getting new ones (tomei's, I've heard they are the same as nismos), used ones or getting something like DW injectors for cheap.. What do you guys think? |
09-02-2011, 10:09 AM | #2147 |
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I dont trust those low-brand companies. I've used SARD 550cc injectors, and currently using Nismo 740cc injectors.
Its the only way to go IMO.
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-Kyle Last edited by BlackZenkiS14; 09-02-2011 at 11:56 AM.. |
09-02-2011, 11:53 AM | #2148 |
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Fucking STi injectors. That's what I have. Hitting 90%+ duty cycle already.
Get name brand. Something as important as fuel shouldn't be cheaped out on. I'm gettong SARD 850s. Bigger is better
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09-02-2011, 02:59 PM | #2149 |
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@180sx: Dont get DW's on a rom tune.
Latency of DW injectors are different then were the rom tunes are mostly programmed for (Nismo/HKS/Tomei 740's). If you do.. they run shit while cruising. Wot is no problem. I had them and switched to Nismo's on my jwt ecu.
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09-02-2011, 03:12 PM | #2150 |
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BTW I am going on the dyno for a tune in two weeks (hopefully, as soon as my tuner is available)
I am planning on running 10-12 psi until I get some parts installed (metal g, arp studs, etc) 14+ psi next year (I will be getting a ported stock manifold with an external gate before next summer) here is a video of my tuner with his sr20 powered 240sx 9 second 240sx 9.99 149.5mph - YouTube I will be posting a dyno grap when I have it hoping for 270whp on a mustang dyno |
09-02-2011, 04:53 PM | #2152 |
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i found its cheaper to just go top feed. jgy makes a fuel rail that is supposedly compatible with top feeds and a freddy/greddy manifold, and they even can customize them to work with a nismo stock style fpr. thats the main reason i didnt want to go top feed, was the fpr that is brand new.
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09-02-2011, 08:34 PM | #2153 |
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I would NEVER run Deatschwerks. The atomization sucks. The flow might be documented, but redrilled injectors will never have the same atomization quality as Nismo or other NEW injectors with laser cut holes. But that's just me.
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09-05-2011, 10:44 AM | #2156 | |
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Quote:
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09-06-2011, 07:05 AM | #2159 | ||
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Quote:
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And that's just the thing, by the time you get a good deal on them, send them to be tested, pay for the procedure and then send it back, it's often another 75-100 dollars out of pocket. SoOOOO many people don't realize that when buying stuff like injectors and I usually alwys suggest new, unless they knew the previous owner/car.
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09-06-2011, 07:12 AM | #2160 | |
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In fact we were just teasing a good friend of mine who has over 40,000 miles on a B14 DE-T setup, no issues at all and it does 5-6 track events a summer now for 6-7 years...dead realiable engine setup, JWT ECU/JWT S3 Cams/28RS car (made 360 whp at 18psi) There is just something tobe said about the JWT stuff in these cars, it is super quality items
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