OFT Tune for GrimmSpeed Intake

[Koa]

I have realized that without a wideband o2 sensor, I realistically cannot fine tune the MAF scale.

Also, I just noticed that I have a small leak at the axleback portion of my CBE. It's a FT86SF V2 single exit with a Vband clamp that connects the midpipe to the muffler portion. The Vband got crushed apparently on a nasty hit. Got a new clamp on the way and I'll monitor how that changes things

I don't know how that's going to affect the tune. @steve99 , @Shiv@Openflash , does a small leak affect things significantly?

[steve99]

Originally Posted by Koa

I have realized that without a wideband o2 sensor, I realistically cannot fine tune the MAF scale.

Also, I just noticed that I have a small leak at the axleback portion of my CBE. It's a FT86SF V2 single exit with a Vband clamp that connects the midpipe to the muffler portion. The Vband got crushed apparently on a nasty hit. Got a new clamp on the way and I'll monitor how that changes things

I don't know how that's going to affect the tune. @steve99 , @Shiv@Openflash , does a small leak affect things significantly?

If the leak is way past the 02 sensors it will not effect the 02 sensor reading.

Its generally only leaks at header gaskets or 02 sensors or cracked header that will effect readings or the connection to overpipe. Anything past overpipe is unlikely to effect reading.

The front 02 sensor is good enough for NA boosted you would definitely need wide-band due much richer afr under boost.

The oft tunes have rescaled the front 02 sensor to about 11.3 afr from memory. stock scaling is 12.1 i think.

[Mad1723]

Got my answer back from OF: No custom tune for the GS intake is available for stage 2. So, just use the OTS Stage 2 map if you have a header or wait for this custom made one here

[Sauce]

Originally Posted by steve99

w

If your stage 1 tune its easy to make your own

their are only two tables different between grimspeed stage 1 and original v2xx oft stage1 tune
tables are

PRIMARY OL FUEL TABLE
MAF SCALING

see 700G rom zip file attached, use romraider to compare this one to the oft sage1 700G map and you will see. use the definitions from oft site for V2.xxx tunes.


then just copy and paste those two changed tables into your rom calid map

WARNING: This is only for stage1 oft maps. Stage 2 maps both petrol and E85 have offset maf scaling and different PRIMARY OL FUEL TABLES. You need to do a bit more work to get the grimspeed intake working correctly on stage 2 maps

enjoy your grimspeed intake tune

Will the values be the same regardless of what calid one has? For example I'm on Stage 1 B01D tune, could I take the values from your 700G map and use it without issue, or would I need a B01D map for the GS intake?

[TruRace]

Originally Posted by Koa

It should ballpark you nicely Please do a log after driving around for a bit @ 60F IATs (if possible) so we can compare. I can also help if you never re-scaled your MAF before. @vgi 's program is sooo nice.

http://www.datazap.me/u/trurace/stg2-uel-e85-grim-v1

This is a log after I rescaled off of your maf scale. This was around 80F though, which isn't bad for around here. Days like this are rare in Florida.

[Koa]

Originally Posted by TruRace

http://www.datazap.me/u/trurace/stg2-uel-e85-grim-v1

This is a log after I rescaled off of your maf scale. This was around 80F though, which isn't bad for around here. Days like this are rare in Florida.

I'm starting to think my IATs are way too low for good tuning.. because in traffic they climb to 100+, so it skews my trims if I'm in bad enough stop and go. I am exploring methods on zeroing out the iat comp table and going from there, but need more time and attempts to learn about it

[steve99]

Originally Posted by Sauce

Will the values be the same regardless of what calid one has? For example I'm on Stage 1 B01D tune, could I take the values from your 700G map and use it without issue, or would I need a B01D map for the GS intake?

The oft maps use same maf scaling in all stage 1 maps
All stage 2 petrol maps have same maf scaling
regardless of calid
but the maf scaling between stage 1 & 2 maps and E85 maps is different.

ie you can take scaling from a stage 1 700G and put it in a stage 1 B01D

[FrostedFlakes]

Originally Posted by Mad1723

Got my answer back from OF: No custom tune for the GS intake is available for stage 2. So, just use the OTS Stage 2 map if you have a header or wait for this custom made one here

Thanks for the update. I was really hoping to see the potential of the Grimm combination with ofh. Especially if all the claim it is one of the better headers out there (I still believe it to be true in terms of bends and flows) I guess we will have to stick to the one size fits all stage 2 for now.

[Koa]

Originally Posted by FrostedFlakes

Thanks for the update. I was really hoping to see the potential of the Grimm combination with ofh. Especially if all the claim it is one of the better headers out there (I still believe it to be true in terms of bends and flows) I guess we will have to stick to the one size fits all stage 2 for now.

Did you see my post containing a MAF rescale for the G/S Intake + OFH?

This is most of the work that needs to be done to have the v2.06 tune play nicely with the intake and header combo.

A side note, off-the-shelf tunes are often needing a rescale or tweak to get to work with your system, even with identical parts setups. This has many variables to it, but main variables are fuel quality and environmental conditions. Just some food for thought, hope you try it out. Let me know if you need any help

[phobos512]

It's been a while since I've flashed with my OFT so can someone refresh my memory?

When I go to install the tunefile for the Grimmspeed CAI, do I need to reflash to stock first and then install the file for the GS CAI, or will the OFT allow me to flash the GS CAI file over the tune I already have installed?

[steve99]

Originally Posted by phobos512

It's been a while since I've flashed with my OFT so can someone refresh my memory?

When I go to install the tunefile for the Grimmspeed CAI, do I need to reflash to stock first and then install the file for the GS CAI, or will the OFT allow me to flash the GS CAI file over the tune I already have installed?

Just flash the new tune, all flash devices erase the ecu before flashing.

[phobos512]

Originally Posted by steve99

Just flash the new tune, all flash devices erase the ecu before flashing.

Ok awesome thanks!

[Koa]

Originally Posted by steve99

If the leak is way past the 02 sensors it will not effect the 02 sensor reading.

Its generally only leaks at header gaskets or 02 sensors or cracked header that will effect readings or the connection to overpipe. Anything past overpipe is unlikely to effect reading.

The front 02 sensor is good enough for NA boosted you would definitely need wide-band due much richer afr under boost.

The oft tunes have rescaled the front 02 sensor to about 11.3 afr from memory. stock scaling is 12.1 i think.

fixed the exhaust leak and, this may not be the case, but no more IAM drop in traffic and no FLKC or knock corr. None, not even tip-in. Could the leak have been that significant to throw things off?

I'll take a log tonight but after 3 days with the fix, IAM has not dropped to .88 once. It would do that every day coming home w/ traffic. Mixed weather conditions as well past few days so there's that

[steve99]

Originally Posted by Koa

fixed the exhaust leak and, this may not be the case, but no more IAM drop in traffic and no FLKC or knock corr. None, not even tip-in. Could the leak have been that significant to throw things off?

I'll take a log tonight but after 3 days with the fix, IAM has not dropped to .88 once. It would do that every day coming home w/ traffic. Mixed weather conditions as well past few days so there's that

yes exhaust leaks at header cause 02 reading to be in correct high fuel trims and incorrect afr results if it gous lean it will cause knock and iam to drop.