8V ABA/Counterflow Hybrid Jetta

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secondgen

8V ABA/Counterflow Hybrid Jetta

Post by secondgen » Tue Feb 26, 2008 8:06 pm

2L ABA shortblock
Heavily worked 1.8L Counterflow head w/ TT 276* camshaft
Mustang TB/tps and an adapter plate
19# VR6 VW injectors
MS1 V2.2 MSnS
Bosch External Ignition Control w/ MSD Blaster Coil

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Last edited by secondgen on Wed Jun 04, 2008 7:11 pm, edited 1 time in total.

secondgen

Re: 8V ABA/Counterflow Hybrid Jetta

Post by secondgen » Wed Jun 04, 2008 3:49 pm

Been doing lots of tuning, daily driven and some race tuning at the local track. Drives very well i think for what i know (or don't).

Decent daily drivability, aside from the cold starts. No idle control so, it's choppy untill i hit 130*. ~25mpg mixed highway and town driving. Sparkmap is still unchanged. Haven't ventured into that tuning area yet, still trying to get fuel where i want it. :D

The motor has had a few changes since the last post; the updated specs are:

Camshaft retarded to a total of 6* (was 2*)
24# Bosch Injectors (Blue tops)

Running on the attached MSQ file at the moment.
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secondgen

Re: 8V ABA/Counterflow Hybrid Jetta

Post by secondgen » Wed Jun 04, 2008 7:29 pm

This is a dyno from a tune prior to the current one, in which the AE settings were causing a super rich spike on fast opening throttle. This has since been (kinda) taken care of.

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secondgen

Re: 8V ABA/Counterflow Hybrid Jetta

Post by secondgen » Mon Jul 28, 2008 8:54 pm

Latest Tune. Removed the mustang throttle body and adapter plate and installed a California-only spec. Digifant 2 Throttle body, features a TPS as apposed to the WOT and Idle switches found on the federal equipped cars. Slight tweaking to account for this change. Also fixed a few vacuum leaks where the manifold was welded back together.
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secondgen

Re: 8V ABA/Counterflow Hybrid Jetta

Post by secondgen » Tue Sep 23, 2008 9:23 am

Newest tune attached, upgraded to the MS1-Extra HiRes code, drives smoother and seems to be getting better gas mileage and holding a steadier idle cold and warm.

Leaned out to 17-18:1 in light throttle cruise on the highway at RPM's under 4k. Starts richening back up to 14-13:1 above 4k RPM. Smoothed out peaks in ignition table, and set 35*adv. in same light cruise conditions as stated above on the fuel map.

Moved MAP vac. line to a port closest to the secondary butterfly on the TB to try and smooth out some of the MAP 'noise' i was seeing in logs, seems to have worked. Also now sees max. MAP faster on quick throttle changes.

Motor coming back apart this late fall/winter for some upgrades.

**EDIT**

Just did ~900miles this last weekend to H20international in MD, this tune yielded me 36.8 MPG on the highway. Made it down in one tank, and back on almost 3/4 of a tank!!
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secondgen

Re: 8V ABA/Counterflow Hybrid Jetta

Post by secondgen » Tue Nov 25, 2008 8:06 pm

Had the car dyno'd tonight, before I tear it apart for the next stage of the build.

Had some problems with the A/f, running very lean, then overcorrected, and ran really rich.

Best was 116hp/128tq, max torque coming in at 2500 RPM and staying around 125ft/lbs untill about 4800 RPM.

Not a ton of power, but VERY fun to drive! Stay tuned for the new motor set-up!

8valvehead
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Re: 8V ABA/Counterflow Hybrid Jetta

Post by 8valvehead » Tue Jan 29, 2013 3:02 pm

Still tuned! Still waiting!....

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