I just installed the Buschur Stage 1 on my otherwise stock IX MR. I've talked to a few people with this setup and I'm about 40 awhp short and 4 tenths off in the 1/4 mile.

I am running 23 psi, but because I'm in CA it's tuned for 91 oct. and I'm using the high flow cat with the magnaflow muffler. Could this be part of the problem?

I also noticed that the flange from the downpipe to the cat has a mild leak. Would the exhaust leak hurt the performance that much?

Any other ideas please post them. Thanks!

 

practice driving more
small leakes in the exhaust well not hurt you

 

It's being tuned for 91 and having a HFC instead of a test pipe that is holding you back.

 

So you dyno'ed it? How much power did it put down?

 

Yeah I am definitely interested cause I was looking at that package and wanna know what it is really putting down....

 

I didn't actually dyno it, I have a performance meter that records various things including hp. It's around 20 lower than awhp because of aerodynamics but I went from 220 to 255 hp.

 

this isn't really telling you anything concrete. get it dyno'd and then you'll know.

-M

 

It is concrete enough to do a baseline then the after and see the difference. But I just smoked a brand new supercharged Saleen so I guess I'm okay with the performance.

 

Who tuned the car? What did you use? Ecutek?

 

Your signature is out of date! It is possible that on cali 91 that 23psi is too much, and the ecu might be pulling timing. Search about max boost on 91oct.

 

It's the Buschur Stage 1 (filter, TBE, MBC) with the ECU Flash from Al at Dynoflash.

Yeah, I need to update my signature, I'm waiting until I make a good 1/4 mile pass. Good idea about the ECU pulling timing. I searched and found people running 23psi on 91, but I'll mess with it anyway and see if I can get better HP numbers.

I did cut my 0-60 time from 4.72 stock down to 4.40 on Friday so with a good run my 1/4 mile should be much lower.

 

Al recommends 21psi on 91oct I do believe... If your times are still slow turn it down and see what happens.

 

I turned it down to 21 psi and it's doing a little better. I noticed the boost doesn't hold that well. If I go WOT at 2700 RPM in 3rd it gets to 21 psi at 3200 RPM then it flutters down to around 19.5-20 psi at 3600-4000 RPM. Sometimes it will get back up to 21 psi once it gets up to 4700-5300 RPM.

 

seems like your spiking to 21 but your boost is 20, try a bit more boost? that is if you want to hold it more consistently.

 

When we refer to boost levels, we are referring to the spike. Never tune your boost for where it holds steady - tune it for the spike.

23 is too much unless you get custom tuned in person - run 21.

That phenomenon with the boost going up, down, then up again is very strange, but I've seen it happen on a bunch of IXs. I've seen it on Dynoflashed IXs, stock IXs, and Vishnu-tuned IXs. Go look at some IX dynographs from Vishnu and see how the boost log does exactly what you described. I still don't know what causes it.

How do you know you're .4s lower in ET/MPH when you haven't gone to the track? You have to realize that you're stock ET/MPH are already .3s and 4-6mph below IXs elsewhere, too.