Jeep T.B conversion on 420a

[qwik59]

I've done quite a few t.b mods on everything from my dad's LS1 C5 to my girlfriends 3.8 Mustang and was planning on moddin my brothers stock t.b. I came across the Jeep t.b swap and I can get a good deal on one of those so figured I'll just mod up one of those and swap it in. Just curious as to whether or not any of you guys have gotten any track results or dyno results from doing this swap.

 

[Doug99RS]

I don't know of anyone that's actually put the thing on a dyno but I know I finally had some top end acceleration that wasn't there with the smaller TB. However, idle to 3K is was considerably slow. While the concept of fabbing something ourselves is great, the time to fab, troubleshoot and make it work may not be worth while. I would recomend just buying a larger TB from one of the multiple suppliers out there.
Doug

 

[GSGoinFast]

I've done quite a few t.b mods on everything from my dad's LS1 C5 to my girlfriends 3.8 Mustang and was planning on moddin my brothers stock t.b. I came across the Jeep t.b swap and I can get a good deal on one of those so figured I'll just mod up one of those and swap it in. Just curious as to whether or not any of you guys have gotten any track results or dyno results from doing this swap.

the only supplier ive seen sell a 60mm is ModerPerformance.com most others are bored stockers or replacements but only go up to 55mm or 57mm

 

[SoilentGreen98]

the only supplier ive seen sell a 60mm is ModerPerformance.com most others are bored stockers or replacements but only go up to 55mm or 57mm

Hell yes, that's what I plan on doing shortly, along with a matching 60mm P&P on the IM to match up to it.




BTW, nice going Chris on getting bumped up to Wiseman.

 

[ninjai_ruken]

Also do not get the MP 60mm TB Unless you plan on upgrading your cams at the same time, I upgraded my Cams, Cam Gears, Intake Mani, and 60mm MP Tb at the same time. It helped alot the power that was not there between 4500RPMs to redline was there I could feel it....also the new turbo kit helped alot

 

[GSGoinFast]

BTW, nice going Chris on getting bumped up to Wiseman.

hey thanks man, i owe you for some of that. thanks for recommending me

Also do not get the MP 60mm TB Unless you plan on upgrading your cams at the same time, I upgraded my Cams, Cam Gears, Intake Mani, and 60mm MP Tb at the same time.

Did SnoopySLR get new cams and cam gears when he put his on? because he will rant on and on about what good gains he got from it N/T

It helped alot the power that was not there between 4500RPMs to redline was there I could feel it....also the new turbo kit helped alot

 

[SoilentGreen98]

Also do not get the MP 60mm TB Unless you plan on upgrading your cams at the same time, I upgraded my Cams, Cam Gears, Intake Mani, and 60mm MP Tb at the same time. It helped alot the power that was not there between 4500RPMs to redline was there I could feel it....also the new turbo kit helped alot

Hmm, I already have AEM cam gears that need to be installed, didn't purchase any cams though. Any instances of problems you know of from using all those mods except for upgraded cams?

 

[ninjai_ruken]

Hmm, I already have AEM cam gears that need to be installed, didn't purchase any cams though. Any instances of problems you know of from using all those mods except for upgraded cams?

Not that I know of... My lil brother put one on his RS with out any other mods other than CAI and Exhaust and it just killed his low end the car felt so slugish

 

[bullettdsm]

I've done quite a few t.b mods on everything from my dad's LS1 C5 to my girlfriends 3.8 Mustang and was planning on moddin my brothers stock t.b. I came across the Jeep t.b swap and I can get a good deal on one of those so figured I'll just mod up one of those and swap it in. Just curious as to whether or not any of you guys have gotten any track results or dyno results from doing this swap.

I am really happy with the results of my Jeep TB (other than the spring problems which I finally solved, Oh yeah and my funny spinning IAC but that was probably due to the stock jeep one crapping out). I have run from a stock TB to a 60mm Tb on my same set-up and have found that the 60 by far out performed the others (I also took the bevel out of the 60mm). I have not dynoed it yet, but I want to dyno the difference between the 55 and the 60 (probably in the next couple of months). I don't have the 55 anymore (someone else does) but I have been trying to talk to Shaun (?sp) over at ConceptIllusuions to bore one for me. His price is cool (he even powder coats it for you Woo-Hoo!) and the bore is nice but the one he did for me was just slightly overbored so I wanted to be sure it was just a mistake. As for the mods, you can check out my mod list. I lost a little bottom end with the 60 but it is made up for with the top end (also the UDP was very helpful as was the exhaust cam gear at 3 degrees retard - need the overlap). IMO port and polish is VERY important. At least gasket match and TB match. I also did my own porting as I see what I think should be taken out. If you want, there was a previous post called Port and Polish (I wish I knew how to make those stupid hyper links ) where we talked about this extensively. I know that the cams will be helpful but I don't think they are necessary for the mod itself. The thing that I like about this mod is that it is different from just bolting on an MP 60 (and cheaper). But I am also a masochistic SOB so I seem to like the annoyance of making the mod. Like I said if I can get Shaun to call me (or write me back) I am going to get the dyno difference of the 55 vs 60.
MB

 

[qwik59]

Thanks for the replies! By saying modding the t.b, I mean thinning the shaft, shortening/countersinking the screws, knife-edging the plate, smoothing the transitions, and polishing it; no boring. Planning on keeping the stock size bore as I have no major plans for this engine other than CAI and possibly some exhaust work. I'm actually more of a Jeep person and will tell you now, it you guys are in need of more flow, you'd probably be better off looking around the Jeep t.b's, you can find PLENTY of 60mm+ t.b's for much better prices than your direct replacement ones.

 

[speedy13]

i had my car dynoed with ajeep tb.all my mods(check my profile)exept for the p&p of the im.my car had 130k and it was about a 99 deegres in the dyno shop.(MIAMI) .I got 120 whp and 106 Lbs of tque.some other tuner who shall remain nameless.with very similar mods,but he had no tb,but he had afctuner,got 112 hp,his car was AT,mine 5speed.good mod,once you get rid of the spring problems.

 

[GSGoinFast]

i had my car dynoed with ajeep tb.all my mods(check my profile)exept for the p&p of the im.my car had 130k and it was about a 99 deegres in the dyno shop.(MIAMI) .I got 120 whp and 106 Lbs of tque.some other tuner who shall remain nameless.with very similar mods,but he had no tb,but he had afctuner,got 112 hp,his car was AT,mine 5speed.good mod,once you get rid of the spring problems.

CoughMikecoughakacoughmiamieclipsecough

i think theres too many variables there to use that as a comparison. the ATX-MTX is a big thing. we should get the "unknown" person to get a 60mm tb and dyno again

 

[SoilentGreen98]

Not that I know of... My lil brother put one on his RS with out any other mods other than CAI and Exhaust and it just killed his low end the car felt so slugish

were they just put on or were they tuned as well? that could always be key, I wouldn't see any reason for it slowing down

 

[ninjai_ruken]

were they just put on or were they tuned as well? that could always be key, I wouldn't see any reason for it slowing down

My guess would be because of the cam profile's there really was not enough how should I put this (Umph) to benifit from the TB at low RPM's......If he had done a P&P Maybe it would have help'd a little more. I just did not see the gains untill he put some cams and cam gear's in and had the car dyno tuned. But like I said you are going to have to draw your own conclusion. and even if it does kill your lowend a little bit....its not like you cant unpgrade your cams later sorry for any spelling i just woke up

 

[esi-slowboy]

You don't need to spend 100$+ for a jeep tB just bore it out 57mm match it to your I.M. And if you're willing to clean up your stock manifold (remove casting burrs,and port-match to the heads) you wont exceed your Volumetric Efficiency (just learned term) Which is how much air the engine can actually pull in compared to its displacement.You wont need to upgrade cams like the aforementioned and you wont lose your low end.
This will definately be a boost in power throughout the power band

 

[qwik59]

You don't need to spend 100$+ for a jeep tB just bore it out 57mm match it to your I.M. And if you're willing to clean up your stock manifold (remove casting burrs,and port-match to the heads) you wont exceed your Volumetric Efficiency (just learned term) Which is how much air the engine can actually pull in compared to its displacement.You wont need to upgrade cams like the aforementioned and you wont lose your low end.
This will definately be a boost in power throughout the power band

Well, the VE is MORE determined by the intake and exhaust flow rates of the head. But yes, external intake modifications could allow the head to come higher to it's available flow rate on the intake side, which could skew the VE a bit. I was considering doing some exhuast work on it, but really not sure as the system appears to be pretty decent, not all too restricted, there is also the possiblity however that it actually has dual layer piping, something I wouldn't know. I'll have to start a new thread now....

 

[bullettdsm]

You don't need to spend 100$+ for a jeep tB just bore it out 57mm match it to your I.M. And if you're willing to clean up your stock manifold (remove casting burrs,and port-match to the heads) you wont exceed your Volumetric Efficiency (just learned term) Which is how much air the engine can actually pull in compared to its displacement.You wont need to upgrade cams like the aforementioned and you wont lose your low end.
This will definately be a boost in power throughout the power band

Boy you guys are gonna cost me money$ I wanted to do just the 55 vs the 60 on the dyno. But now I am thinking about putting the 57 into the mix. Curiosity is killin' my bank account. Where, and at what price glory, did you get your 57?
MB

Oh yeah, boner points for using the fun new terminology!

 

[bullettdsm]

Also, the Jeep TB should not cost 100+ That's the beauty of the mod. It should be around $60 in our junk yards. I spent $75 because I was impatient.
MB