I knew this awhile ago but I never posted anything about it. Self tuners here that have logged their stock 9's (when they where stock) probably know this as well but it's good information anyway.

A stock 9 runs very rich up top (10.2-9.8 ) AFR, thus it also runs very high injector duty cycles.

Here is a comparison of IDC 100% stock and after my base flash:



Just a wee bit better. Base flash running 11.0 AFR up top, stock flash was running approx 9.8-10.2

98% IDC compared to 80%.

This was a 100% stock Evo 9, on 91 octane, with the factory flash. My base flash is not a custom tune, but it still made good gains:



Runs less timing up top (stock timing maps knock on 91 octane). Boost is 100% the same between factory and base flash as wgdc is maxed out stock.

The biggest gain with my base flash was 6600 rpm and up, where the factory map takes a nose dive because of a very rich AFR. In this case, it is a 47whp gain going to my base flash over the factory map. Peak torque gains of 22wtq, approx 37wtq up top and a large gain to spool over the factory map.

Again, this is a 100% bone stock Evo 9 with the only mod being my Base Flash.

And three pulls back to back with no cool down to verify the base flash was consistent:

 

Nice, Bryan. I've seen this in every IX that I've tuned. I can also easily max out the stock injector's with an 11.9:1 AFR and 25 psi. I always recommend 750cc injector's to my customer's with IX's even if they will never upgrade from the stock turbo.

 

Nah stock injectors are ok...

Now fit a gm3port to that IX and bump the boost up a bit

 

I've done a bunch of stock 9's with our boost assembly (oem line and upgraded pill) and a flash and they usually gain another 30whp/25wtq, usually making around 270whp/265wtq on our dyno

The 8's usually need a TBE, boost control and a flash to make that power on our dyno.

I still think the 9's are the best Evo's yet. I might change my mind after I work with the 10's more.

 

Its amazing how much the lean spool disable at 7000 rpm richens the AFR.

 

yea those IDC's jump up at 6900-7000 like they are shooting for the moon.

 

25psi on a stock turbo at 11.9 was maxed? Wow, must be some good air. I think the most I saw on mine on the stocker with stock injectors at that level was 93-94%. That was with pipes, 3" TBE, and an HKS 280 back when MIVEC was young...heheh

 

25psi not at redline thou :P

do you guys get spark blowout at 24psi+? (obviously I could regap them but meh!!!)

 

I've run 28-29psi on a bunch of 9's with no breakup on stock plugs and ignition.

 

Thats where the break up usually seems to start happening if its going to and generally gets more aggressive the higher the boost. .020-.021 gap usually cures it right up though.

Nah it was 25-26 peak (about 285-290 load) dropping to 220s by redline (so probably 21?)

I didnt orignally start having problems till about 30 on racegas

 

I just recently started having some breakup right at peak boost after upping my boost from 28 to 30psi. But not all the time. I am beginning to think my stock coils are getting weak or something from all the hell I have put them through, or I have a boost leak

 

lol you guys are crazy

 

Yeah, no kidding. That is horrible.

 

Might be plug wires, from what I have heard they wear out way before coils.

I have been lucky to not have any breakup so far. I have gone as far as 31-32 psi on meth with no problems. I'm keeping my fingers crossed.

 

To me, anything over 90% IDC is maxed. I don't like the idea of injectors going static on a customer's car. On my car, I don't care as much.