Drove up in the rain-made it on the Dyno around 3am.

First pull, no changes-20psi (creep to 22 by redline) 450whp/400ft lbs. Full boost by 4.8k

http://www.doitbig.org/coltboostin/pics/4GX7/done/dynostockhead/rx7dynostockhead 066.mpg (right click-save as please)

AFR's were a bit lean for me on pump gas 12.2-12.5, so I turned to fuel up. Made 468/413 next pull with 11.2-11.5 AFR's.

Go to 110 leaded "pump" gas, play with restrictors for a few pulls-get it to spike to 30ish psi, and hold just under 30ps to redline (only 7k, since my stock Hyundi head/cams own me)

564whp 490ft lbs trq. With nice and thick 11.0-11.2 AFR's. It was 4am, so we went to stake and shake. I dont see the need in trying to get the tune "perfect" with all the junkyard parts on the car.

Chart
http://www.doitbig.org/coltboostin/pics/4GX7/done/dynostockhead/IMG.jpg

*note-boost reference was taken pre-intercooler

Pics
http://www.doitbig.org/coltboostin/pics/4GX7/done/dynostockhead/

With how responsive the system is, I would have to say the Twin turbo setup works, and I think I will be refining it over winter. Both turbo's still feel mint, and both compressors are 100% perfect, even with well over 1000miles of flogging with my "ghetto" ram air induction.

Cliff notes on set up

4G64 w junkyard Hyundai DOHC head
Stock Rusty Hyundai cams
JMF RWD intake/w Q45
Twin China 50 trims
Mild welded "BoBo" manifold
Single used Tial 38mm
Fidanza Flywheel
ACT 2600/6 puck clutch
JP Fab whatever is laying around intercooler plumbing
"look what I found" DSM 255lhp fuel pump
1600cc injectors
DSM Link
GM MAF-T
China intercooler
2.5x2 to 4inch exhaust (1/2 of which made from Cummins stock exhaust)
Jp Fab Alt relocation
"Peek-a-boo" Ram air induction
Junk ass Cobra wheels with BFG's

I will toss a good head on it over winter, with Cams I already have for the car. I do expect to make anywhere from 100-200more whp more, since I will rev it to 8k, and the power will climb all the way to that point. As long as ti does not run out of turbo, or the lack of good exhaust flow does not choke it up, it seems like it should beat the Colt's 708whp.

The kicker-you can duplicate this fro $4475. Although I did not spend that much, thanks to always scavenging for cheap used parts, and my Grandfathered sponsors JMF and DSmlink, if you have a harbor freight mig welded and a little bit of time, you could have quite the FUZION for less than 5k total investment.

Thanks to Jim at JMF
http://www.jmfabrications.com/

And Tom at DSMlink
http://server.dsmlink.com//

For your amazing products!

More videos/timeslips/40 rolls to come.....

Congrads, I still am amazed you actually built it and more so got it to work so well. A few people have tried and failed pretty badly.

I may be contacting you in about a yr's time as I will possibly try this swap sometime around then.

RipperXX said:

Congrads, I still am amazed you actually built it and more so got it to work so well. A few people have tried and failed pretty badly.

I may be contacting you in about a yr's time as I will possibly try this swap sometime around then.

Click to expand...

Thanks.

Yeah, I honestly did not expect it to work this well, especially with ALL the HATE I received just for suggecting the idea. I am glad I went through with it.

yea a friend of mine has a 94 FD and I keep telling him to stick a 4G63 or 4 in it . He gets mad every time!

something along the lines of "Shit man, mitsu's little 4banger is a HELL of a lot more reliable than that pos wanker engine (love to call it wanker haha). And has a good powerband that is as good if not better for that car. etc.

I have convinced him to consider a LS1 though cause he is about to drop 9k in the 13b which I am calling him retarded for. Yea great engine for racing not for the street imo.

I called him last night and told him about this thread and he just laughed. Turns out the guy that is going to build his 13b doesn't really want to swap in the LS1 so he said hell with it he is going to go the route of the rotor.

No conviceing him I have tried. He is about to drop $7500 into just the engine and turbo setup then have to drop about $1200 more for stronger axles .

The guy building it claims he can get him an easy 400whp with a T76 turbo and EMS with 1600cc 2ndary injectors.

RipperXX said:

I called him last night and told him about this thread and he just laughed. Turns out the guy that is going to build his 13b doesn't really want to swap in the LS1 so he said hell with it he is going to go the route of the rotor.

No conviceing him I have tried. He is about to drop $7500 into just the engine and turbo setup then have to drop about $1200 more for stronger axles .

The guy building it claims he can get him an easy 400whp with a T76 turbo and EMS with 1600cc 2ndary injectors.

Click to expand...

Thats it?!


My god-I am convinced that RX-7 people (at least on the internet) are the dumbest group of car people out there. You should see how ridiculous 3/4 of the posts on RX-7club are!WTF

WTF