Which final drive should I be using with a long rod 2.4 and gtx 3582 Generation 2 [5speed Evo 9]? I was thinking loading the engine a little harder might help, but those are tradeoffs I'm uncertain about. Top speed is of no relative concern. Cruising rpm would be of some relevance since it will see street and highway. It's a street car first and foremost, just looking to optimize..


the situation: I am working with a 9:1 2.4lr motor and a twin scroll t3 1.01 gtx3582 gen 2. We saw late boost, 30 at near 5k last year with 12 psi waste gate springs and 3 port using VIPEC. We sorted the car out pretty well in the low boost settings and guessed that the gates probably are a little bit hindered using only 12 psi springs and a reference port to the top. If it were a 4 port that would have been better. So we switched to 24 psi springs.

 

I would put a 4.11 final drive in it, with Evo8 first, 3rd, and 4th (or PAR straight cut 1:1 4th), and the Evo9 5th gear.

Spool up sounds terrible. 6466 with T4 1.15 twinscroll out spools that, with 1bar springs in tial MVS gates and 3 port boost controller. I would log emap, that housing may be overly restrictive and hurting spool up. If you see emap is exceeding imap before peak boost, you'll have your answer.

 

That's on the list to do for sure. The intake manifold is already tapped in the egr port ( no emissions on this manifold). I built this after the professional awesome build .

The other thing is I am going conservative on the mivec since I'm not sure how far I can go for ptv interference ( I didn't build it and I don't plan to lol) . I've only used values up to 30* and it'd be less than that considering the timing nuances with the new deck height.

The PA build hits solid below 4500 well below, but they're on corn and have ported head. We will be doing a ported head this year. 4 pistons probably

 

4.11

 

I’ll do a log soon showing the spool difference of the stock 4.53:1 vs my new 4.08:1 in 3rd gear.

 

Nice, looking forward to that. I think a longer 1-2-3 would be really great in this case for fun too.

 

Not a problem, but need to see if I have some data to compare it with. Today it is raining so I'll do it next chance the weather is clear. I don't think the Gen II GTX3582r is a great fit for a 2.4L because the turbine is small especially considering you're running twinscroll. My data from the 2.15L showed a 6268 (S362) spooled as well as a 6262 (GTX3582r), but made +50hp and the car was way less knock prone. I wouldn't be surprised if a custom S369 with the 73mm turbine also did well on a TS 2.4L.

Not sure why you are having lazy spool, but perhaps it was from running the smaller gate springs. I also maxed out my springs at 24psi and have zero issues with spool. A few things regarding the turbine housing, if that is a new Garrett unit according to them they size the a/r the same as an open scroll so the 1.01a/r should actually be a decent size. However, in most cases a 1.01a/r T3 TS will flow less than a 1.01a/r T4 TS because with the smaller physical size of the T3, the "r" is shorter so to maintain the ratio that means you have a smaller "a," which is the area. I don't think this would negatively effect your spool, but definitely your emap as suggested.

I think you'll like a 4.11, but I will let you know my Mfactory 4.08 has a whine on decel. If this is your DD then the EVO 8 5th gear is a great addition to the trans because I can cruise around 80mph at 3K RPM. I couldn't personally justify the cost to swap in some of the other EVO 8 gears because the numerical differences are so small I'm not sure you would tell a difference.

 

Interesting, again the car kinda copied was the PA build and they had great spool. Ported head and fuel is the only real big changes ( **** displacement too ) which I will agree are huge. Maybe that set up just works better on e85? Did a quick log this morning to check just waste gate pressure with the new springs see attached. I did not believe that t3 ts 1.01 and 35 wheel would have been not as responsive as I had hoped especially due to back pressure down low. I will add that it has a hks sport exhaust and a 3.5" exhaust is being considered. I will get real screens of the log here shortly

 

Hard to tell what is going on in that log so perhaps change the x-axis to RPM and I assume you have a different scaling on the y-axis on the right. Here are my dyno and street results comparing the Gen I GTX3582r (6262) vs the S362 SXE (6268). Your 2.4L should be no worse than mine in terms of spool and in reality it should actually be better.
https://www.evolutionm.net/forums/ev...-pump-gas.html

 

Heres a quick screen grab of the log. sorry im using open office in this old laptop lol.

this is just wastegate spring and appears to creep a little.

 

That does seem a bit laggy for a 2.4 but its still making 20 psi by 4300

I'd suggest running 11.2-11.5 . These are old engines and they live better there. Its not a K series.

Running it on the richer end of the spectrum will keep the heat down.

 

First pull of the season and coldest the car has ever seen. It was below zero.. I did add a couple percent to the iat correction tables after this.. I'm assuming that is an iat correction anyways.

It doesn't feel as laggy as the data would lend you to believe. Is that the twin scroll doing its job ?

 

10-4

I remote tune a car in South America a bit. Its a 2.0 mivec with an ETS kit. GTX3582r gen2. It makes 20 psi by 4100-4200 on pump fuel. It goes to 8500rpm well so its a wide powerband.
https://gyazo.com/5d7ac04a1bf3718fc6fb85437fc0463a

 

that's really nice. I definitely anticipated being sub 4500 with this. Just dropped the 1650's in so the next decent day ill go ahead and give it a little wgdc and see if I can get the boost to come up quicker.

I'm also looking to see what I must do to check intake valve to piston clearance and see how far I can advance the mivec. I'm probably missing a little there .

 

Interesting, don't see any change in spool and both done in 3rd gear. The only change was the final drive swapped from 4.53 (blue) to 4.08 (red). 34psi @ 4300rpm on 93 pump tune.