S15 Autech Vs R34 Gt

[kubiakGTR]

hey guys just curious what your opinion is in regards to the s15 autech vs r34 gt n/a both manual. which responds best to mods, which is better performance wise, which reliablity wise is better?

any help would be appreciated thanks,

[SKiT_R31]

You would be best off with the Autech S15, far better power to weight, close ratio 6 speed etc. However all the mods are pretty much done for you, so apart from maybe management/dyno tune, you'll end up with ~ >100kw/tonne (120-125rwkW in 1200kg car).

Above option will also be a fair bit better option legally as far as attention from the popo goes.

That said there is an R34 for sale on here with similar CR and 128kW at the wheels, you lose the gearing and weight advantage, but it still wont be too slow, will sound better and is the cheaper option + better for passenger.

I'd definitely go the S15 though (better resale if you don’t ruin it, less 'skyline hate', faster, better handling).

[zebra]

If you want to mod either of them then dont buy one imo

I'll assume you are a P-plater, If you want to buy one than go the S15.

BUT leave it stock and buy a Turbo 34 or S15 later to play with.

Neither car in NA form is a rocket and they do not give good gains per $ spent on mods

[SKiT_R31]

Also, if you wanted to get a little serious and had some disposable cash you could 2.2L stroke it, plus if you look in the US there are ~160thou oversize sleeves and pistons... so you could square it at 90mm stroke and 90mm bore @ 2.3L, or I think you can get longer strokes, either way thats a 15% capacity boost and if that could net you ~10% more power you'd be in business.

edit: though I do agree with zebra, but the smartest option isn't always the most fun, I’ve been off my p's for years (not that we had/have those laws in Tas anyway) and if I was in your situation, I know I would still do it, 3 years is a long time. I had a high performance car after 6 months of being licensed, and by first year I think I was a better driver than I am now (though yes did take more risks).

*shrugs*

Edited November 14, 2010 by SKiT_R31

[Serg]

It all comes down to what you want out of it...

P Plater legal N/A's arent quick stock, and the diference of having 1, 2 or full car of passengers can change its performance noticably. (Who cruises alone these days?)

S15 are quicker cos of the power to weight ratio!

But for the price of an N/A S15 you can probably have a R34 and have a couple mods added to it which will even it out.

But beware, Modded N/A's is the same thing to driving a turbo when it comes to P plater law! I mean you can still get charged with 3 demirit points because it is considered a mod to increase vehicle's performance.. But I havnt heard of anyone yet being done for having exhausts/pod filters/ECU's, etc in this field, only the standard defect notices/EPA's, etc...

Edit: I know its hard and is the best option to save up and just buy a turbo car later on, but if youre like me with still 3 years of P's to go and cant resist imports, just buy one and slowly do up everything less performance mods, so that when it comes to getting off youre p's you can just do an engine swap since you wont be able to sell it for a decent price anymore plus the risk of selling it and buying something dodgy will be always present.

[SKiT_R31]

But beware, Modded N/A's is the same thing to driving a turbo when it comes to P plater law! I mean you can still get charged with 3 demirit points because it is considered a mod to increase vehicle's performance.. But I havnt heard of anyone yet being done for having exhausts/pod filters/ECU's, etc in this field, only the standard defect notices/EPA's, etc...

Agree, and that's why the S15 is the best option imo, as all the usual mods are standard so you can’t get pinged for them. If you were to only change ecu with say a Type 4 nistune, they would never know, ditto for internal mods such as capacity overbore/stroke.

You'll probably struggle to get a better power output from the RB25 than the S15 with only basic mods anyway (unless you want to up the CR, fit cams, etc), so even with passengers, a lighter starting weight is more ideal.

Plus better economy .

[mad082]

+1 for autech

[OoskylineoO]

+1 serg and zebra

much as I love the r34 the s15 would b a more sensible option if your planning to sell it later on...but personally I'd buy the r34 anyway cos its what I like and the sound the autech sr20 with an exhaust makes is horrible.......to me lol, I wonder why nissan bothered to add the rear seats in an s15 it is pointless....LOL or maybe cos the ppl in japan are smaller? ahahah

[Owgasm]

Eg Civic..... hehe

Seriously though, absolutely spanked my mates autech S15 and stock Aus Delivered S14 (highway).

Or a Pulsar VZ-R N1... This kept up with the civic until the pulsar hit the limiter at 180. Stock, carrying me and my other friend. Much more weight than the civic.

Not sure what was done to the civic, but all that was known was that it had some sort of B16 and was completely stripped inside.

Edit, on another note, my mate with the N1 pulsar, also has an Autech S15, that has Tomei 272 cams, springs, valves the works, gears, headers, full titanium exhaust, LUMPY AS F*CK, not sure what was done to the bottom end, but that thing is ridiculous. P-platers dream. Currently getting complied, else i'd get a video

[SKiT_R31]

They already have 272's on the intake side;

http://www.nissans15.com/spec.htm

[R34 -_-]

Have you guys ever seen a drag race between an s15 and an r34? or are you just going off the whole power to weight ration idea??

I don't mean to flame but I have raced an s15 and holy shit guess what, its slow, i won.

- Pod filter + exhaust, no hardcore mods done to both cars.

now that may not mean I'm right but hey it happened.

That power to weight ratio that you are talking about, now yes the s15 is about 200 ish KGs lighter (depending on drivers weight and sound system etc) but its a 2L, 4 cylinder engine... less torque less response...

On paper the HP is similar and the weight difference certainly makes the S15 seem like the winner but the power in an s15 doesn't come out until your twisting its nuts at high RPM. (one car i drove didn't even seem to have power to be honest)

Pod filter + exhaust, no hard core mods done to both cars

Edited November 18, 2010 by R34 -_-

[SKiT_R31]

Its highly dependent on the driver, without an aggressive launch of course it’s going to bog down and lose the traffic light grand prix to 80/100kmph. Also remember we're talking about the Autech not a standard S15 (there is a big difference if you combine power and gearing).

By all means, get whatever. I'm not a big fan of SR20's, they rev slow and feel unresponsive compared to the RB25, plus sound like balls (and sound is a big thing for me - I think I'd varex it) but I'd still have the S15 over the R34 if it had to be N/A.

I'm talking from experience from driving SR20DE and SR20DET (SSS/S13&S14), but I've never driven the Autech S15.

Edited November 18, 2010 by SKiT_R31

[FrangaR33]

+1 for autech

+1

The resale value on the S15 is going to be a hell of a lot better 3 or 4 years down the road when you come to sell it compared with the 7 or 8k you'd end up getting for your R34.

[mad082]

Have you guys ever seen a drag race between an s15 and an r34? or are you just going off the whole power to weight ration idea??

I don't mean to flame but I have raced an s15 and holy shit guess what, its slow, i won.

- Pod filter + exhaust, no hardcore mods done to both cars.

now that may not mean I'm right but hey it happened.

That power to weight ratio that you are talking about, now yes the s15 is about 200 ish KGs lighter (depending on drivers weight and sound system etc) but its a 2L, 4 cylinder engine... less torque less response...

On paper the HP is similar and the weight difference certainly makes the S15 seem like the winner but the power in an s15 doesn't come out until your twisting its nuts at high RPM. (one car i drove didn't even seem to have power to be honest)

Pod filter + exhaust, no hard core mods done to both cars

i've beaten a natro 33 in the missus SSS pulsar, so it's all relative. the power isn't as high in the rev range as you would think. pull well from 3000rpm, pull really well from 4500rpm. i would assume tha autech sr20 would pull even better.

[R34 -_-]

I haven't driven an "Autech" version either but even with a close ratio gearbox I could imagine it still not reving out as good as an Rb25.

1st gear my car pulls hard, unless you fark the launch up its feels a lot better off the mark than an S15

Then if its rolling start from 2nd i would smoke an s15 for sure, to me na s15's are only suited to windy road driving where your not slowing down too much for corners or having to blast it on long straights so your keeping the revs/speed up becuase as soon as you drop down into low rpm its like trying to get a fat kid to run uphill.

Oh and if we are comparing a special version of silvia to a skyline we might as well use the special version of skyline, the "GT V"

(LSD, Turbo suspension, Turbo size brakes, better re sale value as its pretty rare)

Edited November 19, 2010 by R34 -_-

[Owgasm]

They already have 272's on the intake side;

http://www.nissans15.com/spec.htm

My mistake, checked with him, Duration is 288 with 12.8 lift

Lumpy dumpty.

[mad082]

an autech s15 should run in the 15 second bracket 1/4's (people have run high 15's while others have run flat 15's), which isn't much different to a NA skyline.

[ACTIVE-LSD]

I owned an Autech S15 for 1.5 years when i was on my Ps. it was excellent car for a non turbo. unique and clean. can and will keep with alot of bigger cars. in terms of reliability, it depends on the condition of the car you get. i got mine for a premium price. genuine mileage backed up with books etc. the time that i owned it everything was smooth. abit of advice if you do decide to buy one. make sure the engine itself is in top condition. because if it fails. your screwed. autech sr's are hard to come by.

[tornaido_3927]

Just in case anyone is interested.. I have a N/A R34 and my brother has an Autech S15..

We both agree my car is more powerful, the lack of torque from the 4 cyl engine is very noticeable and I can't even stand to drive it. It just feels like another 4 cyl car. Not saying my Skyline is a supercar, but the difference is definitely there.

[R34 -_-]

Just in case anyone is interested.. I have a N/A R34 and my brother has an Autech S15..

We both agree my car is more powerful, the lack of torque from the 4 cyl engine is very noticeable and I can't even stand to drive it. It just feels like another 4 cyl car. Not saying my Skyline is a supercar, but the difference is definitely there.

oh hey look exactly what i said ages ago in this thread, might as well close the thread now it has been confirmed.