1g head on 2g engine..what else do i need?

[Slow95gsx]

I have a 1g head and im ready to put it on my 95 talon tsi awd....ive heard that i need something else...like a sensor or something...any info. would be helpful
thanks

 

[Airpoppoff]

Originally posted by b16edcrxblitz
I have a 1g head and im ready to put it on my 95 talon tsi awd....ive heard that i need something else...like a sensor or something...any info. would be helpful
thanks

go to magnusmotorsports.com they have a whol tutorial on it?

 

[jake98gst]

what are the advantages of running a 1g head on a 2g bottom end?

thanks,
Jake

 

[Agent Ezzard]

I bet you wouldn't feel a thing........

 

[Mike 99GSX]

http://www.roadraceengineering.com/1g2gheadswaptechtip.htm

 

[Airpoppoff]

Originally posted by Agent Ezzard
I bet you wouldn't feel a thing........

the 1g head flows alot better than the 2g. and the intake manifold is bigger

 

[Agent Ezzard]

Most people including myself knows that the 1g head flows more than its 2g counterpart. Unless you have some monstrous drag turbo set up, you wouldn't feel crap. Why do you think Mitsu put on the different head/IM/TB/turbo/CR combination when they changed body styles in 95?To decrease perfomance (to spend more money on on developing another head that would make the car slower)? Or to produce an automobile with much more torque that appeals to all buyers (females in particular) looking for a quick car rather than catering to the few of us who are all about performance. Many big guys in DSM performance use 2g heads because of their flow characterstics rather than the 1gs flow rate. I would have to say that I never ran a 7 bolt with a 1g head but I have run a stock 6 bolt, stock 7 bolt, and a built 6 bolt with a T25 and the performance in my opinion (with the help of time slips) is that you wont notice much of anything when it comes to swapping heads. So like I said before, unless you are running some rediculously oversized "bragtoyourfriendsabout" then it would be a waste of time unless your 2g head got jacked up some how.

 

[greyforestgst]

Originally posted by Agent Ezzard
bla

You must be logged in to view this image or video.

You must be logged in to view this image or video.

 

[jdmawd]

Good lord

 

[Agent Ezzard]

Also from RRE where the pics came from...

Why do all this? The 2G car has a little honda sized throttle body, intake manifold, and intake ports. That is one of the big reasons the 2G's have better bottom end power but are a little slower at the drag strip. Example: 1G intake port at the gasket is 60mm x 37mm, 2G measures 56mm x 28mm.... ouch! Throttle bodies are 1G - 60mm vs. 2G - 54mm While a 1G head and intake manifold flow more than a 2G head and intake manifold, too many people are in a big hurry to do the swap when they have not maximized their current set up. Even a Cali car can run well into the 11's on a stock 2G head and intake manifold. A well ported 2G head and Extrude Honed manifold will take you even further. If your 2G head dies a horrible death from a suicidal T-belt, go ahead and do the swap while you are fixing things up.

OK b16edcrxblitz, came back and show proof of any marginal increase in power. I'm done here.

 

[Mike 99GSX]

Originally posted by Agent Ezzard
Most people including myself knows that the 1g head flows more than its 2g counterpart. Unless you have some monstrous drag turbo set up, you wouldn't feel crap. Why do you think Mitsu put on the different head/IM/TB/turbo/CR combination when they changed body styles in 95?To decrease perfomance (to spend more money on on developing another head that would make the car slower)? Or to produce an automobile with much more torque that appeals to all buyers (females in particular) looking for a quick car rather than catering to the few of us who are all about performance. Many big guys in DSM performance use 2g heads because of their flow characterstics rather than the 1gs flow rate. I would have to say that I never ran a 7 bolt with a 1g head but I have run a stock 6 bolt, stock 7 bolt, and a built 6 bolt with a T25 and the performance in my opinion (with the help of time slips) is that you wont notice much of anything when it comes to swapping heads. So like I said before, unless you are running some rediculously oversized "bragtoyourfriendsabout" then it would be a waste of time unless your 2g head got jacked up some how.

I'm not sure what your point is here. I don't think any 2g owner who is going to go through the trouble of going through a head swap is going to be running a T25. I do not think you need a "monstrous drag turbo" to get an appreciable difference between the 2 heads. If I had to guess, I would say though that a T25 probably would make less power on a 1g head than a 2g head on the otherwise same setup because it wouldn't be able to move enough air. However, I'd say that about any turbo bigger than a 16g is going to benefit in the top end from the 1g head.

 

[Cablefed]

You guys make some very valid points. To bad most people won't take that into consideration before spending money they don't need.

 

[jake98gst]

I've seen people running 1g IMs and TBs on stock 2g heads. (larryd, for example, I think did this). Wouldn't this be a significant restriction to have big runners on the 1g IM and to then force the air through the smaller 2g head intake ports?

Jake

 

[Mike 99GSX]

Originally posted by jake98gst
I've seen people running 1g IMs and TBs on stock 2g heads. (larryd, for example, I think did this). Wouldn't this be a significant restriction to have big runners on the 1g IM and to then force the air through the smaller 2g head intake ports?

Jake

Your not forcing all of the air into the head because the 1g mani does not match up to the smaller 2g ports and the air is just hitting the side of the head. I'm sure it makes a small amount of difference but for the amount of trouble in getting the mani off you might as well do it right and swap the whole head.

 

[zdrux]

Ahem..

I`m running a 1G head + cams + manifold in my '97 GSX. Now I don't know how much more power you get out of the 1G head because I don't have a similiarly setup dsm with a stock 2G head on it.

I`m running an 18G with 550cc and 3" turbo-back. I must say the car is no slug and I`m very happy with it's performance but like alot of people will say, it's hard to judge something like this when the car is no longer stock and there are THOUSANDS of difference "mod" configurations that may alter the way the head puts out performance. It may be a 10% hp increase with one setup and yet cause a 10% hp decrease with a different setup.

Bottom line is I think it is un-fair to say right off the bat that this particular swap is a waste of money or resources. This is like having a debate on wether an EGT guage is actually usefull or not. Some will swear by it, and others will say it's no better than an graphical A/F guage.


I think this is something that must be decided by the owner of the car and not the "majority" of the people. thanks

 

[Generation X]

Originally posted by jake98gst
I've seen people running 1g IMs and TBs on stock 2g heads. (larryd, for example, I think did this). Wouldn't this be a significant restriction to have big runners on the 1g IM and to then force the air through the smaller 2g head intake ports?

Jake

Yes... that is why it's recommended to port match the 2g head, or just use a 1g head to match the runners on the 1g intake manifold, if not, your just basically wasteing your time.