6bolt = 190hp 7bolt = 210hp

[Matts95TSiAWD]

why? this is what the "stock output" is on these motors.

 

[Kapok6]

One big difference between the 2 motors is that the 7bolt has 8.5:1 compression ration and the 6 bolt has 7.8:1. So higher compression plus the same amount of boost (12lbs) = more horsepower.

 

[Hammer_Gaidin]

Its not that it's the motor difference, it's the generation difference. 1g 190hp, 2g 210hp. The 1g are 7.8:1 Comp, while the 2gs are 8.5:1.

 

[thegreatms]

Its not that it's the motor difference, it's the generation difference. 1g 190hp, 2g 210hp. The 1g are 7.8:1 Comp, while the 2gs are 8.5:1.

Exactly; the 7-bolt 1Gs (93-94) are listed at 190 just like the earlier 1Gs.

 

[never2muchBoost]

don't 1g's run 9psi stock?

 

[Pro3racer]

2g's run 9psi stock, 1g's run 11psi stock.

 

[stephenz]

14.5psi 2g,drops off to 10psi above 5500rpm's

9psi 1g

stephen.

 

[speedy13]

don't forget that the 2g 4g63 has the same head as the evoIII which outflowed the 1g head.I know,iknow,the 1g head has way bigger ports,but the 2g head flows air at higher velocity and more of it,so this revised head with higher compression and whualla 20 more hp.

 

[allgripnoslip]

My 97 awd, when all i had was a boost gauge, it read 11psi

 

[clownface]

lemme get this straighten out

6bolt 90-early 92 i believe
7bolt late 92-99

90-94
1gen 2.0 turbo 195 HP 4g63
1gen 1.8L na 95-90? HP 4g(something)
1gen 2.0L na 135 HP 4g63

95-99
2gen 2.0 turbo 210 HP 4g63
2gen 2.0 na 140 HP 420a
2gen 2.4 na 140 HP 4g64

2gen turbos run 11 or 12ish psi give or take alittle depending on the car

1gen turbos run 7 or 8ish give or take depending on car

1gen turbo compression is 7.8:1
2gen turbo compression is 8.5:1

2gens have smaller turbos, better exhaust manifolds, worse flowing heads, worse cams, worse intercoolers, run higher boost, higher compression ratio, worse flowing intake manifolds and smaller throttle bodies and they have a lower peak HP in the RPMs

1gens have larger turbos, worse exhaust manifolds, better flowing heads, better cams, better intercooler, run less boost, better throttle bodies, better intake manifolds, lower compression ratio, have a higher peak HP in the PRMs

thats just to name some of the big differences

 

[Kapok6]

don't 1g's run 9psi stock?

I show 12 lbs of boost stock on my aftermarket boost gauge.

 

[clownface]

Your profiles says you have a big 16g, those turbos wastegate springs may be set for the 12 psi area, however this is not a stock car.

 

[Matts95TSiAWD]

so does this mean because of the higher compression the 2g motor has more potential than the 1g?

 

[clownface]

so does this mean because of the higher compression the 2g motor has more potential than the 1g?

Nah, if we take 3 stock engines a stock 6bolt 4g63, a stock 1gen 7bolt and a stock 2gen 7bolt motor most people would agree the 1gen stock 6bolt would ahve the most HP potential.

The best "stock" parts engine would be a 6bolt block, crank, and rods, 2gen 4g63 pistons, 1gen head with 1gen cams, 2gen exhaust manifold, 1gen intake manifold
this would have the most potential then any of the 3 mentioned above

 

[Matts95TSiAWD]

i have a 6bolt in my 2g right now, and i have a 7bolt motor doing nothing. would those 8:5:1 2g pistons slide right into my 6bolt w the 1g rods? without machining.

half of everyone tells me 2g head flows better, the other half swears the 1g head flows better, i cant decide which one it is.

 

[clownface]

No i bo believe the need some slight machining to get them to fit right, if i remeber its a small job and shouldnt cost much, they fit in the block just fine, its the rods that need alittle work to get them to fit right. All i have ever heard or seen is that the 1gen head flows better however i cant back this up with much other then thats all iver heard.

 

[awdtaylon]

this is how it is... first of stock rating is 195 hp for 1gs and 210 for 2gs. this is not just due to the difference in compression.

1gs have less boost. 10.5 psi
2gs have more boost . 12 psi

the 2g head actually flows alot better than a 1g head. the manifold aswell its just designed better. the 1g head and manifold do have bigger ports however which is why 1gs will smoke 2gs in the quartermile but trap lower speeds.

also its not just teh horse power rating by itself i believe for 1gs its 195@ 5500 rpms while 2gs its 210@4000 rpms

the reason 2gs have more horsepower with an inferior turbo is due to all of these things.

higher compression
more boost
better flowing head and intake manifold
better flowing exhaust manifold
and a better intake system

a 1g with just the same amount of boost and the same intake system will probably make more power than a 2g

 

[reveal1123]

the reason 2gs have more horsepower with an inferior turbo is due to all of these things.

higher compression
more boost
better flowing head and intake manifold
better flowing exhaust manifold
and a better intake system

I'll agree on the compression, head, exhaust mani and the intake system, but i'll disagree w/ the intake manifold part. Why would all you 2g lovers upgrade to the 1g intake manifold?

 

[clownface]

this is how it is... first of stock rating is 195 hp for 1gs and 210 for 2gs. this is not just due to the difference in compression.

1gs have less boost. 10.5 psi
2gs have more boost . 12 psi

the 2g head actually flows alot better than a 1g head. the manifold aswell its just designed better. the 1g head and manifold do have bigger ports however which is why 1gs will smoke 2gs in the quartermile but trap lower speeds.

also its not just teh horse power rating by itself i believe for 1gs its 195@ 5500 rpms while 2gs its 210@4000 rpms

the reason 2gs have more horsepower with an inferior turbo is due to all of these things.

higher compression
more boost
better flowing head and intake manifold
better flowing exhaust manifold
and a better intake system

a 1g with just the same amount of boost and the same intake system will probably make more power than a 2g

some of this isnt correct

a 2gen is 210@6000
as for a 1st gen im not sure but i know its the same or higher

the 14b turbo 1st gens are running less boost then the 13g turbo 1st gens from the factory
a 13g is set for a bout 10-11ish psi, a 14b is for 7-8ish psi
I should have stated this earlier

I would like to see proof that the 2gen head and intake manifold flow better. I was under the impresson that the 1st gen intake manifold and head were better as common DSM knowledge.

 

[GSTinCO]

All of you are sort of correct on the heads, I think it's best explained as the 2G heads flow better but 1G heads flow more.

 

[clownface]

All of you are sort of correct on the heads, I think it's best explained as the 2G heads flow better but 1G heads flow more.

AAA ic ic, that makes more sense i think

 

[speedy13]

I'll agree on the compression, head, exhaust mani and the intake system, but i'll disagree w/ the intake manifold part. Why would all you 2g lovers upgrade to the 1g intake manifold?

exactly what i think.oh and clownface.If you take a trip to your local magazine store and buy the last issue of modified magazine it explains in detail in the dsm tuning section why the 2g head is better then the 1g.I was under the same impression as you until i read this very informative article.The 1g can still basically outflow the 2g,but in very high rpm/race only applications.In the lower more street usable rpm's the 2g head is better because of it's capability to flow more air with a higher velocity.again more details in that article that i can't recall right now.

 

[clownface]

exactly what i think.oh and clownface.If you take a trip to your local magazine store and buy the last issue of modified magazine it explains in detail in the dsm tuning section why the 2g head is better then the 1g.I was under the same impression as you until i read this very informative article.The 1g can still basically outflow the 2g,but in very high rpm/race only applications.In the lower more street usable rpm's the 2g head is better because of it's capability to flow more air with a higher velocity.again more details in that article that i can't recall right now.

Well ill just take your word for it, but i might swing by the store and grad that issue just to get more of the details.

So now what it sounds like is the better head and intake is more determined by the drivers application.

 

[Syndicate13]

My god there is a lot of misinformation being slung around in here. With the horrible design of our intake manifolds you'd be hard pressed to find any difference in flow between the 2 heads. The 1G head does have larger ports but there is also a hump that air has to flow over to reach the valve. The 2G head ports are a straight shot at the back of the intake valve, less turbulence = potential for more power. However if you are pushing the limits of maximum airflow through the head you would want larger ports. Now, no one should go out and swap to a 2G head because it's a better design, the entire 7 bolt motor in design is better than a 6 bolt motor and no one is scrambling to swap a 7 bolt in. Both heads have been in the 10's which is faster than what most of us here are ever going to run so make use of what you have.

 

[dsmkid95]

ok i just had a 1g 7bolt installed into my 2g. (only reason is because i just had a new 7bolt cluch flywheel put in before motor blew) was it a wise choice or should i have dumped the new clutch and flywheel and popped in a 1g 6bolt.