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Discussion Starter · #1 ·
ok.... so let's say i got ported and polished head, $1200.... high torque cams, $300?? then a good catback exhaust $300 a high flow cat, $50 a MAF from a 1988 RX-7 $30-50??? i'd be puttin.... what, like, 140-145hp at the ground for $1900???? and then have an additional.... how much hp from say, 11.0:1 compression pistons and forged rods? with an additioonal ??$$

or i could spend $1200 on a GTX swap and be putting like 150 to the ground or so??
 

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hard to tell... high torque cams could mean anything... what kind of lift? duration?

There's no way to give you a real good estimate, you'll want to upgrade your ignition system, fuel system, get set up with a good engine management system... A GTX swap sounds slightly simpler, and you know they make 180 crank hp right there.
 

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well you count all the conflicting stickers and the wing height and the tailpipe diameter and it's pretty simple addition lol
jk
 

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Discussion Starter · #4 ·
James92Scort said:
hard to tell... high torque cams could mean anything... what kind of lift? duration?

There's no way to give you a real good estimate, you'll want to upgrade your ignition system, fuel system, get set up with a good engine management system... A GTX swap sounds slightly simpler, and you know they make 180 crank hp right there.
yeah so that equates to about 157 whp
 

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^ that depends on the drivetrain. a good tranny and a good set of axles throws that "standard" way off.

I've seen 00 Si's dyno 148 to the wheels, with 160 hp at the crank...

on the other side, I've seen some dyno 125 to the wheels. That'll cost you more for axles.
 

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if you want to spend 1900$ on an N/A motor and only get about 30 more ponies, why dont you drop the 1900$ into a good turbo setup with standalone????????????

also the size of your tires/wheels hae a afffect on how much whp and wtq you have. the larger the wheel the more energy it takes to spin them. with larger wheels, it puts more "back pressure" on the drive train which also requires more energy to spin the gears,diff, axels, wheels.
 

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Discussion Starter · #8 ·
marclar said:
if you want to spend 1900$ on an N/A motor and only get about 30 more ponies, why dont you drop the 1900$ into a good turbo setup with standalone????????????

also the size of your tires/wheels hae a afffect on how much whp and wtq you have. the larger the wheel the more energy it takes to spin them. with larger wheels, it puts more "back pressure" on the drive train which also requires more energy to spin the gears,diff, axels, wheels.
yeah, that's what i'm thinkin..... if i kept my stock EGT rims, and just had them cleaned up, and then got some low profile tires for them, i'd be set.... my speedometer would be off, but i'd be all set. maybe i'll find a good set for my next set of tires. i have an almost new set of 50,000 tires, but i've only put 3000 miles on them and already they need to be rotated. i'll probably need a new set within like, 20,000-25,000 miles, and that's what i'll go for. right now i have P195-60R15s on them. so, maybe with like a P205 or a P215 if i can find them, i'd be doin better. anyways, i could always pick up a GTX and build it before i put it in the car. on the stock turbo for that engine, how much boost can you run? how about with better rods and slightly higher compression pistons? what octane gas would i you have to run with the max boost and higher compression?
 

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Is this the I learned everything I know about car tuning from playing Gran Turismo thread?

You're talking about cams and catbacks in the same sentence. It's time for you to do some research.
 

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Discussion Starter · #10 ·
. . .
 

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the stock gtx runs arround 14psi. since you already have the egt that would be the logicalist swap for you. if you had a 1.9 i wuld say definately do the spi swap. personaly i would rather have the spi running 10psi than the gtx running 14 psi. its a matter of HP vs. TQ personaly i fancy torque than hp.

when you do the gtx swap, make sure you use a GOOD EFICIENT INTERCOOLER. those small front moutns are good and all but not that eficient. thats why i got the saab one. its got a larger surface area.
again it all comes down to tuning.
 

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thescortgt said:
anyways, i could always pick up a GTX and build it before i put it in the car. on the stock turbo for that engine, how much boost can you run? how about with better rods and slightly higher compression pistons? what octane gas would i you have to run with the max boost and higher compression?
No need to really build it, it will handle up to 300hp. You'll need a bigger turbo though if you want to get that high and use the stock GT head since it flows better. Also you might need new injectors to support the extra boost. You will need to run premium. And we don't like higher compression pistons with a turbo. Just turn up the boost.
 

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marclar said:
the stock gtx runs arround 14psi. since you already have the egt that would be the logicalist swap for you. if you had a 1.9 i wuld say definately do the spi swap. personaly i would rather have the spi running 10psi than the gtx running 14 psi. its a matter of HP vs. TQ personaly i fancy torque than hp.
you are a turbo god so i dont want to argue but i must... isnt the vj20 wastegate set to open at 8.8 psi at least on the gtx setup i feel since your on an spi you may have been misinformed... on the other hand i may be misinformed.

now to ad my other .02 a guy was selling a motor on erdt that ran him in the 14s all day long he said (im assuming high 14s but 14s never the less) and this was basically with just no options, just motor and car. no ps ac. the motor has the stuff their you dont really need to spend 2000 dollars to help it along... plus to be a total f&f nerd "you get the totally awesome blow off valve PSHT sound... ok now back to pokemon cards" :)
 

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I'd have to conquer... I have a GTX with a boost controller, but when I turn off the controller, I get only 9psi... (probably 8.8, but my gauge isn't that precise! ;))
 

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Discussion Starter · #15 ·
Etienne said:
I'd have to conquer... I have a GTX with a boost controller, but when I turn off the controller, I get only 9psi... (probably 8.8, but my gauge isn't that precise! ;))
so what do you run WITH the boost controller?
 

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gtx ecu is designed to run 330cc injectors. of which run out of effience at 15psi. the vj-20 begins to over spool at this point. yes it wil make more boost but its useless boost.

the gtx is not a honda motor. james this is not a dig one you please undertand that. i was just over @ HMT and some guy is like yeah im going to go track with a 300+hp motor and like low 200trq. yes he will go fast but his trq being low will slow him down.

the gtx makes just about the same amount of torque as HP. so marclar your point is invalid. ne3ek dyno'd at 174hp/176trq (or close to that) at stock 8.8psi on a gt ecu! the gtx runs 8.8 stock. but can handle 15psi and still make power. my car is set for 14-15psi all the time. i have yet to see a turboed SPI run 13's. gtx's can do it at will even on street tires with the right driver. im not saying im that driver. i have yet to track my car since the swap do to no spear rims and tires. but i will get it out there soon i hope. i really hope i do before the end of race season which is soon.


NEUMAN
 
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