ANDREWS GTS-T

[overboostedlebaron]

first here is a link to some pics of the ride

http://www.cardomain.com/ride/3368872

ok heres the deal! i want around 380 whp since ive been readying 400hp on stock internals and gear box is the sweet spot!

THE LIST SO FAR
440CC injectors
FMIC
255 feul pump
AEM WIDEBAND 02
3.5inch exhaust no cat
Manual Boost Controller

OK! now the turbo..im looking at this one

http://cgi.ebay.com/R32-R33-R34-RB25DET-RB25-RB20DET-RB20-480HP-Turbo-Kit_W0QQitemZ150363462986QQcmdZViewItemQQptZAU_Car_Parts_Accessories?hash=item23025c5d4a&_trksid=p3286.c0.m14

And i want a topmount manifold!!!!!!!!!!!!!

so my qustion is can the stock maf handle 300rkwh

and other then that I need a tune but am i missing anything????

[Nissan_Sean]

Nice car.

I think they say 400 bhp is the limit, not 400 whp. So 380 wheel is about 460 bhp which would probably kill the tranny fairly quickly. But even 320 wheel would be about 200 bhp more than stock which would be insanely quick. i think the only other thing that would really help would be some Tomei poncams, just to free up the top end somewhat.

What are you using for tuning? Skym could correct me but i think the Nistune board can handle those numbers.

i think you need the Z32 MAF as well for 300+ whp.

hope that helps, its really late so we'll see if this post made sense tomorrow.

[kyles_r32]

i wouldnt do the ebay turbos ive heard alot of horror stories on them blowing up!!

[love_boost]

i wouldnt do the ebay turbos ive heard alot of horror stories on them blowing up!!

yup lol.
i hear the same stuff, if you want a cheap turbo hound the deisel forums for a holset HX35, turbo is good for bigger numbers than you will see and can be had for around 300 dollars.

[Skym]

Most tuners stick to 400hp at engine with stock RB20DET transmission. Add semislicks or drag slicks and gearbox probably won't last long if you thrash car. Halfshaft's, diffhead's, etc are next to fail.

The record for Nistune + RB20DET (stock piston's, stock crank, stock conrods, stock cams) is around 500rwhp. More than enough for your application. HP is limited by AFM, injectors, stock internals, head.

Options for MAF + Nistune are (at engine) -

Z32 80mm MAF = 480hp

Ford Cobra MAF = 500hp

Ford Lightening 90mm MAF = 700hp -

http://www.superchargersonline.com/product_detail.asp?PartNumber=MM-V8A003-040

Ford MAF is better, but finding a dry type podfilter to fit on them???

[Nissan_Sean]

wow 501. was that all stock internals or just the parts you mentioned? i guess i'll just throw 300 wheel at mine with nistune and just see what happens. I'm starting to get the impression that 20's are damn tough.

[Skym]

If you want to see what others have achieved with RB20DET and different turbo's, mods, etc, look at the RB20 dyno result thread on SAU -

http://www.skylinesaustralia.com/forums/Rb20-Turbo-Upgrade-Dyno-t103095.html

Factory RB cast pistons can handle 100hp per piston or 600hp total for engine. That 500rwhp RB20DET is roughly 36hp shy of that 600hp total at engine. Also that RB20DET was rebuilt and had ACL bearings, ACL? rings, metal headgasket, etc, but using stock internals.

Here's the 500rwhp RB20DET engine (ACL bearings, etc are not mentioned in this link) -

http://www.nissansilvia.com/forums/index.php?showtopic=298289

More pistons a engine has, the higher the hp limit. For example V8, V10, etc. That's why they fit engines with more cylinders in supercars (reliability with higher hp levels).

400hp at engine (with metal headgasket) is safe for a stock internal RB20DET from factory (factory bearings, etc). That's on a high boost setting. Factory bearings can fail due to cavitation (melting surface of bearings) under constant hard use. Use Nismo bearings or Calico bearings (coated ACL bearings, etc) that have a protective coating to reduce cavitation.

This R32 RB20DET runs a genuine 370hp with stock engine with big single, etc. That's 370hp all the time on racetrack -

http://www.youtube.com/watch?v=dkP33kxpHvw

[M13]

How about Q45 MAF?

[Skym]

Similar to Ford Lightening MAF (90mm), but not any better than Z32 MAF in terms of hp (Q45 MAF = 480hp). Nistune can run a Ford Lightening MAF (has the required table data) and is a better option for above 480hp at engine. Those are rough hp estimates.

[M13]

Similar to Ford Lightening MAF (90mm), but not any better than Z32 MAF in terms of hp (Q45 MAF = 480hp). Nistune can run a Ford Lightening MAF (has the required table data) and is a better option for above 480hp at engine. Those are rough hp estimates.

thx,

Are the Ford lightning MAF suitable for blow through system? I'm just going to put my Q45 MAF in for now and eventually replace to the Ford one then.

(nistune)

[Skym]

Most use Z32 MAF over Q45 MAF due to smaller 80mm diameter and uses same podfilter as stock 80mm RB20 MAF. Also fits into stock rubber intake hose on RB20DET.

If bigger custom intake pipe infront of turbo is needed, 90mm Q45 MAF is better.

[Nissan_Sean]

So the stock rb20 can make 300 wheel then. My car will almost never see hard driving, just the occasional pull and dding, so could i get away with stock bearings and no metal headgasket for a while? eventually i would do the hg and throw in some arps and poncams.

[Skym]

It's constant hard use, like thrashing on racetrack that can make stock headgasket fail.

Some are running 1 bar (14.5psi+) with stock headgasket on the street (short burst driving). It's all in the ECU tune that helps with longevity with stock headgasket. Metal headgasket is for better seal around cylinder and longevity (reliability) when running above the equivalent of 1 bar with stock turbo. Nismo rebuilds their engines when fitting metal headgasket.

[Nissan_Sean]

Ya i do have a 20 to build so i probably wouldn't bother with the cams studs and hg, just run it at 300 stock engine until winter then hopefully build the other 20. What turbo do i need to make 300 wheel? GT28? or would i need to go a bit bigger like a 30.

[Skym]

Depends on what your using the car for, like street racetrack, dragstrip, drifting, etc. Street use uses a smaller turbo for low rpm driving (factory turbo peaks boost wise at around 2500-2800rpm) or racetrack use with a turbo that doesn't produce peak boost until around 4800rpm (racing version of RB20DET).

You can use a quicker spooling aftermarket turbo (full boost by 3500-4000rpm, like with HKS 25/30 or I think is GT2860R-5 in Garrett's lineup) and run it at higher boost levels to produce the rwhp. Or run a bigger turbo at lower boost levels (reliability) to produce the rwhp, but put up with a engine that won't make car really move (full boost) until 4500-5000rpm.

For the power level you want (300rwhp), GTRS or I think is a GT2871R in Garrett's lineup (similar specs) would do the job -

http://www.turbobygarrett.com/turbobygarrett/catelog/Turbochargers/GT28/GT2871R_472560_15.htm

You can change exhaust housings to T3, which I think is stock Skyline exhaust manifold flange type. I think GT25 is Silvia and GTR.

HKS list the specs of their turbo's and the PS they produce and mentions that it suits the Skyline exhaust manifold flange (T3), etc -

http://www.hks-power.co.jp/products/turbo/hanyo/turbinesho.html

I think 1 ps = 1 US hp. Be aware that HKS do mods to these turbo's to make them HKS special's and make the turbo's reliable.

You can look at Garrett's website and find a similar turbo spec wise by clicking on desired turbo -

http://www.turbobygarrett.com/turbobygarrett/products/turbochargers.html#medium

For example for GT2860R-5 -

http://www.turbobygarrett.com/turbobygarrett/catelog/Turbochargers/GT28/GT2860R_707160_5.htm

Translated link -

http://babelfish.yahoo.com/translate_url?doit=done&tt=url&intl=1&fr=bf-home&trurl=http%3A%2F%2Fwww.hks-power.co.jp%2Fproducts%2Fturbo%2Fhanyo%2Fturbinesho.html&lp=ja_en&btnTrUrl=Translate

Translater if translation link doesn't work -

http://babelfish.yahoo.com/

Find a turbo that matches the desired hp and do some reasearch (find dynocharts) to find out where desired turbo produces fullboost on stock engine.

For example, SAU RB20 dyno result thread -

http://www.skylinesaustralia.com/forums/Rb20-Turbo-Upgrade-Dyno-t103095.html

Be aware that smaller exhaust A/R (Radius of where exhaust wheel goes to area of inlet to exhaust housing) and smaller exhaust wheel size helps to get full boost earlier but chokes the turbo at high rpm's, boost levels. Bigger A/R, exhaust wheel is the opposite. By just changing exhaust wheel, boring out same A/R exhaust housing to suit, can add and extra 1000rpm or so before full boost is achieved.

The correct way to select turbo for your engine, is to use calculations (or calculators), which can be found on the internet.