T2 2.2 to 2.5 conversion how much HP gain?

[Brian Putman]

Quote:

Originally posted by Ben Paquin humm Ross...any reason why ? Just checking. And how much did they run you ?

Because to my knowledge they are the highest quality and the strongest available! They are very very nice!!!

[glhsken]

Brian, the RP design?? If so... yea.. stout and built to protect the tops from peeling...

[Brian Putman]

[quote]Originally posted by BadAndy
[b]You know......I think this might be something that is important and a good idea however I don't think it is as drastic as it has been played out to be.

I may just be lucky and unexperienced with the 2.5 but I feel that proper engine management negates the need for forged pistons in a 2.5 until the real power is being made (300 and above)

I really do feel that the 2.2 piston is more forgiving to mistakes in tuning and obviously stronger by comparison.....but it's not like a 2.5 piston is junk when it can hang in there and get the job done....how long it will hang in there is my question.

I had already reached the point where 2.2 pistons were failing. Iam not going down that road with the 2.5 if possible. Iam lazy, and don't really like redoing engines every year! But yes I agree, one can go a long way on stock pistons with proper tuning. I did.

[Brian Putman]

Quote:

Originally posted by glhsken Brian, the RP design?? If so... yea.. stout and built to protect the tops from peeling...

Yes, I got them from RP. We'll see how they like 30+psi of 50 trim
next year!!

[DakotaKid]

Quote:

Originally posted by Brian Putman I had already reached the point where 2.2 pistons were failing.

What point is that?

[Ben Paquin]

Quote:

Originally posted by Brian Putman Yes, I got them from RP. We'll see how they like 30+psi of 50 trim next year!!

I didn't realize RP had their custom 2.5 pistons out. I'm late in the news I've been gone for a while...

I have two 2.5 forged engine to build this year. I may try them.

[gti_7]

I thought id show stock figures vs modded ones. these are as rated my Chrysler, so you go figure out their accuracy :big grin: as Mopar likes to underrate outputs figures. But for the sake of argument here they are.

1988
2.2
1 piece intake
mitsu turbo te04h
7-9psi
146hp@5200 168ft-lbs@3600
swirl head
2.25" exhaust housing


1989
2.5
1 piece intake
mistu turbo teo4h
9-11psi peak.
150hp@4800 180ft-lbs@2000
[152hp/210ft-lbs in 1991]
swirl head
2.5" exhaust housing
balance shafts [good for 15hp@6k rpm when removed courtesy Gary.D]


The way i was "taught" about the two 2.x engines was, if you want to rev and go fast [i.e peg your speedo/attain higher speeds per gear] get a 2.2. If you want to wrinkle ashphalt get a 2.5.

Both have their qualities. Wasnt the 2.5 created for better "pick up " in everyday traffic and thats why it feels quicker than a two-two?

also.. for a compariron. in 1989, the 2.2 TII had a 2.5" exhaust housing. 12psi and an intercooler. based on Chrysler reports power out put is the same as the 88+ edition at 175@5200 and 175-2000ft-lbs@4800rpm.

Bernard

[Ben Paquin]

Quote:

Originally posted by gti_7 [b]I thought id show stock figures vs modded ones. these are as rated my Chrysler, so you go figure out their accuracy :big grin: as Mopar likes to underrate outputs figures. But for the sake of argument here they are. 1988 2.2 1 piece intake mitsu turbo te04h

88s have a Garrett T1 turbocharger.
Unless it's a hybrid of some sort.

[Brian Putman]

Quote:

Originally posted by TrboVan What point is that?

Running low 8's@90+mph- 26psi on DOT's in a 2800+lb car. I could probably squeek some 7's out of them on DOT's but not reliably I feel. That was running about 7.5 compression(g-head T2 pistons) and a swirl head advance curve with 100octane fuel. Now I probably went lean @ 29psi and caused the last one to go, but that's the 3rd stock piston I've cracked. I was at the point if everything wasn't just right I could say goodbye to a piston. And I was putting out more power than what my timeslips show due to I was running 18psi to about 45mph then it would go to 26psi after that.

[DakotaKid]

For what it is worth.

I have about 50 passes on my car since August.
.020 over cast pistons

7.295 @ 94.03 in the 1/8
11.525 @ 114.73 in the 1/4

32 psi

So far so good.

-Bryan

[Brian Putman]

Quote:

Originally posted by TrboVan For what it is worth. I have about 50 passes on my car since August. .020 over cast pistons 7.295 @ 94.03 in the 1/8 11.525 @ 114.73 in the 1/4 32 psi So far so good. -Bryan

That's very impressive! And Iam not saying I couldn't go faster on stock pistons than what I did. And I also had alot of passes in my car as well. My car is street driven and the pistons had been in there since July of '02. Along with the same set of plugs(still looked fine). But still at the level of power your at, your on borrowed time I believe.

[Ben Paquin]

I had awesome luck with the 2.2s myself.
With simple +40% injectors 190l/h fuel pump, FP regulator set at 40 psi
Stock 2.2 VNT computer 13 deg Ignition timinjg
Super60 turbo .63 a/r 3" exhaust
Cranking compression 120-125 psi
27 psi + 50 shot nos. they held, that's with 94 octane fuel.
Just to show how though the 2.2 Mahle are, the Lancer was run purposely at 25 psi
with 91 octane fuel instead of 94 pinging loudly. My uncle wanted the engine to die
because he was about to rebuild it with forged JEs anyways.
Those pistons have been abused over and over.
They never broke.

Same setup but 2.5 .030 over Mahle cast pistons
150 psi cranking compression
And Stock TII turbo
23 psi of boost
13-15 deg ignition timing

= cracked pistons.
2 rebuilds with Mahles same result.
1 rebuild with *gasp* Fel-Pro hypereutectics (cracked at 12 psi rich 1400F EGT)
13 deg timing
Mahles were back order.
They are as bad as everyone say....

Conclusion. 2.5s, no detonation allowed.

[BadAndy]

Quote:

Originally posted by TrboVan For what it is worth. I have about 50 passes on my car since August. .020 over cast pistons 7.295 @ 94.03 in the 1/8 11.525 @ 114.73 in the 1/4 32 psi So far so good. -Bryan

Well let me tell you it's worth more than I can afford.....or else I would be going that fast.....lol

Great times! I'm impressed!"thumbs up

[DakotaKid]

Quote:

Originally posted by BadAndy Well let me tell you it's worth more than I can afford.....or else I would be going that fast.....lol Great times! I'm impressed!"thumbs up

Thanks, Just wish the season was not over!

-Bryan

[gti_7]

Quote:

Originally posted by Ben Paquin 88s have a Garrett T1 turbocharger. Unless it's a hybrid of some sort.

Umm.. your thinking of '87
http://www.thedodgegarage.com/turbo_turbo.html#1988

1988 2.2 T1's came with a new style intake and a mitsu turbo.

Bernard