Got some time to tune the car a little bit today for the warmer weather we're getting, I'm pretty darn happy with the results:



The car weight seems a little high, I know, but it was my best guess at including my sub box and amp (amp is a beast, lol).

Mod list is in sig, fuel is standard 93 pump. I've had the S1/S2 combo installed since last September and I absolutely love it. I don't think many others have it, but the car is very peppy, almost stock-like out of boost, and pulls great up top. It's been awhile, but I think I picked up 20 awhp or something like that after installing them, no other changes. I do think I may have a boost leak though, most graphs I've seen of the 71 and similar stock-frame setups get full boost around 3800 RPM. I'm not getting 25 psi until almost 4200 RPM. Haven't quite figured that one out yet. Timing is set to start at 2*, hold 3* until 5k, then increment slowly to 13* at 7500 RPM. This run was knock-free except for a 1 count just prior to spool.

Next up? I'm really not sure. I've thought about doing a ported intake manifold and TB, or perhaps trying out SD but I honestly don't know how difficult that is to do with Tephra V7. I have a logged OMNI MAP sensor already, so I would just need to add the IAT and, obviously, use the SD version of V7. I've also thought about adding a CoP setup, but not sure if that's worth the money to do. Any thoughts are appreciated, as are any comments on the graph. This is my first post of a VD graph so go easy please

Also, this car will likely never see a track. It's my DD and I couldn't care less what it runs, so long as I'm happy with it. To that end, I am very, very happy with it

Todd

 

Nice! I have one and love it.

Something is up for sure with late boost peak

 

This is the first s1/s2 dyno I've seen. Thanks for sharing

 

Yea, I need to do a boost leak test and I'm wondering if having the Injen intake on the 84mm FP cover is hindering me ever-so-slightly. I made some minor timing changes and it *seems* a little better but it's minimal I'm sure.

 

If your injen intake is less than 84 mm there is going to be less flow into the turbo.

 

It is, it's meant for the stock inlet, therefore it's not ~3.5" like the 84mm cover. What I'm wondering is, at 25-26 psi, does it matter? I also still have a MAF... I don't know why, but reading through the SD conversion process does not give me a warm fuzzy. It was so easy on DSM's, lol.

 

is your wastegate adjustable?? I would check your pre-load. that is a common problem on stock framers that spool slow they are blowing the wastegate open ever so slightly but it causes it to spool way slower.

 

Good thought, but unfortunately I'm at the preload limit without breaking out a hacksaw which I honestly don't want to do. I'm using the FP 18 psi actuator. Had I read a little more before picking it up, I would have gone with the 25 psi unit instead.

I have my WGDC at 100% under this load set to 170 in V7 and I need about 70% WGDC to get 25-26 psi, tapering to 22-ish. I do ramp up WGDC with RPM to try and hold boost as much as possible. I've also considered a hybrid boost setup, that seems simple enough.

 

i think you are just opening now because of drive pressure is overcoming the wastegate possibly. you could always try a stiffer wastegate. There is only so much wgdc can do before you reach the mechanical limitation of the wastegate actuator

 

My 71 with a few turns of preload on a 25 psi wga opens at 19 and creeps to 21. Lots of back pressure here.

This is with a muse o2 dump that never crept with my hks cams. I run full s2 cams.

This turbo might shine a little better up top with a turbine clip.

I will consider that when its time to send mine in.

 

top has an inflated tail at the end. should be ran over on a smooth road if you want an accurate number.

That is spooling really bad. i spool fp black's quicker then you just spooled that 71hta. that 71hta should hit like a stock turbo around 3400RPM on a evo 9 with mivec.

Its either the boost control or wastegate. unless you have your AFR way off due to a faulty reading wideband gauge or something along those lines maybe. could be a boost leak also. could also be maybe the timing is not TDC?

 

Op, any updates? I would like to see you sort this out! My 71 hits just about 20 psi roughly 3500 or so, there's charts around somewhere if you search my name.

https://www.evolutionm.net/forums/sh...age=2&t=648939

Err there it is. That's just a reference line with no boost control btw on my set up

 

Thanks Tom. The road seems smooth, it's flat and out in the middle of nowhere which is why I like to use it. I also always use the same road so, even if the numbers aren't perfect, they are at least consistent. I used a different road yesterday evening and got 391 as my number. It was also about 40* warmer from the pull in the OP.

Timing is dead on, I did it myself and I'm no stranger to 4G63 timing belt jobs.

The tail at the end - I have my WGDC increasing from 70% to 91% out the top to try and hold boost. I'll do a boost leak check ASAP and give some thought to picking up the 25 psi w/g from FP. Also, I've considered getting an MBC for hybrid boost but I'm a total newb at that.

Also, you've got a PM.

 

I forgot to mention, I do have what sounds like an exhaust leak at the manfiold gasket. I'm swapping that out this weekend but, now that I think about it, I may wait on that until I get the FP 25psi wga since having the manifold off really does make it a ton easier to install.

 

I forgot to ask, do you have the 84mm cover? Does that affect spool negatively at all?

Edit - I fully realize that wouldn't account for all of the issue, just a random thought I had.