Reverse Split
Reverse Split Hey guys. What are the pros and cons of reverse split dur. and lift. This being on a stock headed ls1,MN6. LS6 intake, LT's, and a pulley. Still has stock catback too. Thanks.
More intake than exhaust duration was created to help out the cars with stock intakes and aftermarket exhausts. Basically the intake sees more restriction so you hold the intake valve open longer to try and make up for it.
On a well flowing engine a traditional split is best, at around 4-6 degrees.
On a well flowing engine a traditional split is best, at around 4-6 degrees.
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
As usual, it all boils down to the combo. I know of quite a few TR230 or X1 high compression combos inthe 10's.
In a setup that can't get 90/90 but with good exhaust runners and header system, they do shine. It is really a matter of preference on parts used.
Exemple: TR 230/224 with TEA stage 2 LS2/LS6 setups. or MTI 230/227 (X1) and their 2E LS2/LS6 heads.
In a setup that can't get 90/90 but with good exhaust runners and header system, they do shine. It is really a matter of preference on parts used.
Exemple: TR 230/224 with TEA stage 2 LS2/LS6 setups. or MTI 230/227 (X1) and their 2E LS2/LS6 heads.
It will idle very smoothly and not have much lope to it. Decent power over stock, but nothing crazy. A lower LSA would pick up a decent amount of power but it would bump a little more.
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Originally Posted by Kraest
I wouldn't do it.
There's a reason why proven tuners like Futral Motorsports and LG Motorsports don't offer reverse splits in their shelf-cams.
There's a reason why proven tuners like Futral Motorsports and LG Motorsports don't offer reverse splits in their shelf-cams.
Ben T.
im leaning towards the x1 cam. MTI web page most of the customers are running there 2e/x1 combos and most are putting down 440rwhp.. so i say it works.. wilwaxu busts 10's with that setup.
Originally Posted by Slacker
I like mine 
With a reverse split you get to push the intake valve closing point back later and extend the power band without changing from any given LSA- all while limiting overlap which for a DD might be good thing.
Also keep in mind that we're getting close to splitting hairs here with this theory. After all, the difference between a 230/224 and a 230/232 could be less than the difference of racing in optimal weather or not.
Ben T.
Also, the stock catback isn't going to choke a reverse split cam that bad because it's going to have less overlap. Increased overlap really makes the inadequacies of an exhaust/intake system show up. I've seen a reverse split cam (TR230) make within 3 hp of an open cut out... and the exhaust was a 3" Flowmaster. If you step up the exhaust lobe from a 224 to a 232 and keep the LSA bascially the same (111 vs 112), then you're going to start losing more power as overlap increases and you're going to give up midrange torque.
A chassis dyno proved me wrong and made me come out from under the assumption that a reverse split cam has to have a VERY good exhaust system. Seems like the big picture encompassing overlap makes a larger difference than lack of duration on the exhaust.
The original poster said he still has the stock catback.
There's a reason why "proven tuners" like Thunder Racing started grinding reverse splits.
Ben T.
A chassis dyno proved me wrong and made me come out from under the assumption that a reverse split cam has to have a VERY good exhaust system. Seems like the big picture encompassing overlap makes a larger difference than lack of duration on the exhaust.
The original poster said he still has the stock catback.
There's a reason why "proven tuners" like Thunder Racing started grinding reverse splits.
Ben T.
Originally Posted by Kraest
I wouldn't do it.
There's a reason why proven tuners like Futral Motorsports and LG Motorsports don't offer reverse splits in their shelf-cams.
There's a reason why proven tuners like Futral Motorsports and LG Motorsports don't offer reverse splits in their shelf-cams.
Bruce
go to the dyno thread section. look up gillbots results with reverse split cam and a 4000k stall. hes putting down 399rwhp.. and thats on stock heads with a mid length header...impressive..
im a big fan of the MTI X1. Im biased though since at one period in time my car put down 415rwhp and 403rwtq, which i fell is a great number for a cam only car that drives near stock and sound great at idle.
Originally Posted by Geoff
The TR230 does ok. 
As others have said, it is all about combination. Just for the record Mike likes to take cheap shots at us whenever he gets a chance.
As others have said, it is all about combination. Just for the record Mike likes to take cheap shots at us whenever he gets a chance.
Here's my results with the TR230: https://ls1tech.com/forums/dynamometer-results-comparisons/476349-tr230-224-a4-dyno.html