Log

Discussion of tuning specific to CX-7 vehicles
Project_cx7
Posts: 35
Joined: July 19th, 2015, 10:37 pm

Re: Log

Post by Project_cx7 »

Its been a while, still having the same issue at wot in third and fourth gears.
2007 Mazda CX-7. Manley H-beam rods, Wiseco 88 mm pistons, King racing bearings, balance the crankshaft, bosch 3 bar map sensor, removed VTCS and egr, JB OCC, JB 3.5 inch intake, FMIC, Forge v1 BPV, BNR S3 turbo, 3 inch catless DP.
Project_cx7
Posts: 35
Joined: July 19th, 2015, 10:37 pm

Re: Log

Post by Project_cx7 »

Here is the last log I did.
Attachments
gen dysart log 10.csv
(18.62 KiB) Downloaded 398 times
2007 Mazda CX-7. Manley H-beam rods, Wiseco 88 mm pistons, King racing bearings, balance the crankshaft, bosch 3 bar map sensor, removed VTCS and egr, JB OCC, JB 3.5 inch intake, FMIC, Forge v1 BPV, BNR S3 turbo, 3 inch catless DP.
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Steve @ VersaTune
Lead tuner
Posts: 1157
Joined: March 29th, 2010, 12:58 pm

Re: Log

Post by Steve @ VersaTune »

AFR at WOT is reading 16.18 at 347.031seconds in the log!!! If that is accurate, that is really bad. I see a fuel cut at 349.092 seconds.
This tune is not right.
Project_cx7
Posts: 35
Joined: July 19th, 2015, 10:37 pm

Re: Log

Post by Project_cx7 »

let me do another log. I remember I fixed a exhaust leak before the primary O2 sensor.
2007 Mazda CX-7. Manley H-beam rods, Wiseco 88 mm pistons, King racing bearings, balance the crankshaft, bosch 3 bar map sensor, removed VTCS and egr, JB OCC, JB 3.5 inch intake, FMIC, Forge v1 BPV, BNR S3 turbo, 3 inch catless DP.
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Steve @ VersaTune
Lead tuner
Posts: 1157
Joined: March 29th, 2010, 12:58 pm

Re: Log

Post by Steve @ VersaTune »

That would explain the crazy AFRs.
Project_cx7
Posts: 35
Joined: July 19th, 2015, 10:37 pm

Re: Log

Post by Project_cx7 »

Here is my latest log. I did the log in 4th gear, started at 3 k until it cut out.
Attachments
gen dysart log 12.csv
(12.08 KiB) Downloaded 470 times
2007 Mazda CX-7. Manley H-beam rods, Wiseco 88 mm pistons, King racing bearings, balance the crankshaft, bosch 3 bar map sensor, removed VTCS and egr, JB OCC, JB 3.5 inch intake, FMIC, Forge v1 BPV, BNR S3 turbo, 3 inch catless DP.
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Steve @ VersaTune
Lead tuner
Posts: 1157
Joined: March 29th, 2010, 12:58 pm

Re: Log

Post by Steve @ VersaTune »

You are most likely exceeding the overboost protection fuel cut limit.
mituc
VersaTuner guru
Posts: 1324
Joined: December 17th, 2011, 2:47 pm
Location: Iasi/Romania

Re: Log

Post by mituc »

Indeed, and the AFRs are still on the lean side. There's a chance that the primary O2 sensor doesn't want to fully collaborate any more. Everything else look.. I could say normal considering....
2008 Cosmic Blue Mazda 3MPS
Built engine + WMI + GTX3071 gen2, ~509BHP @34PSI
2008 Icy Blue Mazda CX7
Stock engine and exhaust (YES!!), JBR3" + GTX2867 gen2 + Autotech HPFP, self-tuned to 330-ish BHP
pankrok
Posts: 14
Joined: May 13th, 2015, 8:12 am

Re: Log

Post by pankrok »

I believe the tune is not heading the right path.

too lean (maybe calibration of no leaks)
high boost not utilized by appropriate timing.

you have a 3.5" maf housing - I would expect that at 4V maf you should have more air , maybe 20-30 g/s more - that could explain the lean mixture. you may check my logs in the next thread - these are also on 3.5" maf housing (still not perfect) so I would expect to see readings more similar to mine in the maf voltage-mass.
As I saw your mods do not include forged piston/rods , these logs with 23psi , lean mixture wont let you drive for long.

without forged internals (if you truly not have) I would try to keep boost lower and play with ignition timing (which will also raise combustion pressure , but at least will give you lower boost air temp, better response and better use of the air you are pushing)
mituc
VersaTuner guru
Posts: 1324
Joined: December 17th, 2011, 2:47 pm
Location: Iasi/Romania

Re: Log

Post by mituc »

His MAF Cal is fine, or at least is close (looks like a Statified aluminium 3.5" JBR intake maf cal). His AFR readings though are totally shot.
2008 Cosmic Blue Mazda 3MPS
Built engine + WMI + GTX3071 gen2, ~509BHP @34PSI
2008 Icy Blue Mazda CX7
Stock engine and exhaust (YES!!), JBR3" + GTX2867 gen2 + Autotech HPFP, self-tuned to 330-ish BHP
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