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I've been very tempted to pick up a copy of HP Tuners and take a look at the tune myself. I used to do my own tuning on my LT1 f-body in the late 90s, but I'd have to spend some time refreshing/relearning before I'd feel comfortable changing anything. Might also get in touch with BlownblueZ06 since he's local and have him take a look at the tune.
You can sometimes stalk some eBay auctions and get them cheaper than retail. Takes some time though.. I bought and sold a few and ended up basically getting a pro interface for nothing when it was all said and done.
Keep in mind you'll also need a wideband. I've had very good luck out of my gen 4 PLX unit. I had a MTX-L from Innovate and it gave me problems constantly after the first few months. The pro interface is usually preferred as it has external inputs for wideband, fuel pressure, etc.. The cheaper/basic interface does not (you can get around this but it involves using one of the AC pressure sensor wires as a wideband input, so not really the best solution in the world)
2020 Corvette of the Year Finalist (performance mods)
C5 of Year Winner (performance mods) 2019
Originally Posted by schpenxel
You can sometimes stalk some eBay auctions and get them cheaper than retail. Takes some time though.. I bought and sold a few and ended up basically getting a pro interface for nothing when it was all said and done.
Keep in mind you'll also need a wideband. I've had very good luck out of my gen 4 PLX unit. I had a MTX-L from Innovate and it gave me problems constantly after the first few months. The pro interface is usually preferred as it has external inputs for wideband, fuel pressure, etc.. The cheaper/basic interface does not (you can get around this but it involves using one of the AC pressure sensor wires as a wideband input, so not really the best solution in the world)
and with the pro you can datalog with just the mpvi in the car and don't have to carry a laptop with you
True... although that feature is broken at the moment, which has a lot of people royally pissed off (including me)
There was a firmware update that came with the latest version of their software (about 4 months ago). The latest firmware added support for a lot of new stuff for the Ford guys, but unexpectedly messed up stand alone logging. There is no way to downgrade.
2020 Corvette of the Year Finalist (performance mods)
C5 of Year Winner (performance mods) 2019
Originally Posted by schpenxel
True... although that feature is broken at the moment, which has a lot of people royally pissed off (including me)
There was a firmware update that came with the latest version of their software (about 4 months ago). The latest firmware added support for a lot of new stuff for the Ford guys, but unexpectedly messed up stand alone logging. There is no way to downgrade.
No ETA on a fix.
wtf!... I don't recall updating mine so hopefully that feature is still working, I'll have to remember to check that next time I'm going to use it
the car runs so well as is that I haven't bothered with it. I've been thinking about adding meth, so would retune when I do that.
I'd have to agree... it does run quite well and if it's not broke don't fix it. Seems a little fat on fuel near the top but I thought that would deter detonation?
I didn't know you were considering meth. I'm leaning to A&A T-trim, meth and already have the headers. I'll start with 4.0 pulley and take it from there. Looking to match the power level of a buddy of mine that lives in the Dallas area. Got a ride in his 2013 that was such a blast, I had to jump back on a Vette... Uh, that would be your fault Evan HA!
2020 Corvette of the Year Finalist (performance mods)
C4 of Year Winner (performance mods) 2019
Originally Posted by imxz28
I'd have to agree... it does run quite well and if it's not broke don't fix it. Seems a little fat on fuel near the top but I thought that would deter detonation?
I didn't know you were considering meth. I'm leaning to A&A T-trim, meth and already have the headers. I'll start with 4.0 pulley and take it from there. Looking to match the power level of a buddy of mine that lives in the Dallas area. Got a ride in his 2013 that was such a blast, I had to jump back on a Vette... Uh, that would be your fault Evan HA!
I have a feeling some of the richness was from the temps during that dyno (probably 50-55 ambient). Remember it was tuned in the summer at the opposite extreme, so I would guess those temp tables are probably more dialed in. However, I'd been debating meth for a while, and having Bret take a look at it anyway since he's a FI guru and lives in Dallas. So might as well do it right and have him do the meth AND tune it. Of course, now I'm thinking if I'm gonna have him tune it and do meth, it might be a good time to drop to a 3.6 pulley from a 3.8...
2020 Corvette of the Year Finalist (performance mods)
C4 of Year Winner (performance mods) 2019
Originally Posted by winters97gt
Might as well swap to the 3.6. You'll pick up a 1-2 psi.
Already discussed with Bret, will be going to 3.6 for more boost.
Originally Posted by schpenxel
afr should not vary with temp.. And at the very least, it shouldn't vary inconsistently.
Good to know.
OP, don't let any of this scare you away, just make sure to find a good installer/tuner and make sure to get a dyno graph with A/F after install. My mistake was just asking about A/F and trusting when he told me it was good. At least I did do a follow up dyno at another tuner with A/F only 6-7 months later to verify, but should have verified immediately.
Might as well swap to the 3.6. You'll pick up a 1-2 psi.
Here is what your dyno should look like AFR wise. This is no meth. Meth would be 10.8 ish.
Here's what my research and calls to ECS and A&A have turned up.
A&A says Si will produce 6-7psi with 4", 8-9 with 3.8"
I'm strongly considering T-trim and the ECS Novi 1500 is almost the same.
ECS advise 11psi with 4.1", 14 with 3.7", 18 (max) with 3.5"
I know all this depends on the lower pulley size but assume standard option as kitted. I think A&A offers 4.0 std with the T-trim which would be about 8psi. Knowing the Si is 78% efficient and T-trim 75%, I'm struggling on which way to go. I doubt that I'll ever push for more than 9 and maybe 10psi. Thoughts?
Basically the "density" part of speed density is based on the temperature of the air. Colder air = higher density = more oxygen --> more fuel needed. Hotter air = lower density = less oxygen --> less fuel needed.
I am getting ready to pull the trigger on a blower setup. I had a 2012 Mustang with a magnuson that put down 550/475 before I bought this vette.
Id like to be in the 550-600 whp mark after install/tune. I have plenty of people telling me to go the A&A route, while many others are pushing me to the Edelbrock setup. I dont mind going either way, but from what I've been reading and searching on here, the edelbrock 599 kit doesn't get me where I want as far as WHP. My car is mostly stock, and I dont plan on doing a cam/meth/headers installations any time soon.
So can some people that have these setups please chime in on power levels on an otherwise stock LS3 dry sump? I'd love to see some dyno graphs before/after with either the A&A or the Edelbrock.
Here's my before and after overlay. Stock 2013 dry-sump GS vs. same car with catted ARH headers and a Magnuson Heartbeat at low boost (~6 psi at the dyno) and my amateur street tune. Both runs on 91 octane junk CA fuel.
FYI.... the blower pull was the second back-to-back pull we made. I drove it ~80 miles, parked it for about 20 minutes, then straight on the dyno. Not exactly ideal conditions, but it is what it is. At least you should get an idea of the gains and power curve.
Just curious how much timing you're running at wot?
Lemme pull up my old tune file and the dyno log....
Okay, looks like I saw 13 degrees at peak power on that pull. Logged 14 degrees near peak torque. I was commanding a peak of 15 degrees up top, but the much higher than normal IATs pulled a couple degrees. IATs were 117 degrees prior to the first pull. It never gets near that on the street.
You'll probably also notice the little KR dip that I hadn't yet eliminated around 3500 rpm. I knew this was pulley/fuel combo would be short lived, so I didn't go too overboard tuning this low-boost setup.
08-08-2015, 03:02 PM
it will be done right for sure
