My HTA68 Experience So Far...WOW

[phil_GSX]

For a bolt in, stock appearing turbo, this little thing is mean! I get instant spool and moving a peak of 53.49Lb/min airflow!
Overall the car feels like it has quite a lot of power, knock is barely an issue, and she pulls extremely strongly.
Never dynoed, or tracked this setup yet. Hopefully will get some 1/4 mile runs in tomorrow evening since the Southbend Stage 4 Kevlar disc is finally worked in. I do however get a noticeable 'decrease' in power at about 6000 RPM and a non-linear power delivery feeling at times. I've attached a log in case anyone would care to help troubleshoot the problem, if there even is a problem.

Setup:
HTA68 V2 @ 30psi
STM aluminum intake
GM Maf in draw through
FP Manifold
STM O2 housing
VRSF FMIC
Stock IM/TB
Wired 255
Stg. 4 Southbend Kevlar Clutch/PP
Aeromotive FPR
1250cc FIC Bluemaxx
Full 3" w/ Cat
DSM Link v2
Zeitronix Wideband
94 Octane Pump w/ water-meth
Other small mods. I'm forgetting
Full weight street car

Just thought I would share my experience with the first 1000km on this years setup.

 

[90laserRSfwd]

Are you on a stock 2 litre motor still? What's the car? (1g 2g etc).. You need to fill out your profile..

 

[phil_GSX]

Sorry, forgot that info..
Yes, I'm on a bone stock, unopened, 100k mile 6-bolt. Car is a 1991 AWD.

 

[90laserRSfwd]

The log a nice look over. I'm curious though, as to why you didn't go WOT until 4600RPM? Can you post a log of a 3rd gear pull from 2,500RPM to redline? Also, I assume your still running a MAF. As I see no reading from an IAT or MAP sensors. BoostEST show's spikes of nearly 40psi (which I doubt is anywhere near correct. Injector duty cycle is maxing around 60% which means you have a good amount left! Timing looks good to for pump with meth injection. Nice work.

 

[92AWDHX40]

He's still running a maf.

 

[Diamond Star Werks]

From the log it looks more like your doing only approx. 40lb/min.

 

[phil_GSX]

Oh really? Hmm I must have misinterpreted the value...
Doesn't my logged 404.4 Grams/Sec convert to 53.49 Lb/min?

Had her out at the track tonight, was getting some hesitation up top, and over ran the MAF once. Managed to consistently run 12.3-12.4 @ 113-114, but if I can get the hesitations sorted I think high 11's are possible..

 

[19gsx91]

Can you post a log of a 3rd gear pull from 2,500RPM to redline?

x2 On this. I am very curious.

 

[m_0ney_pit]

Oh really? Hmm I must have misinterpreted the value...
Doesn't my logged 404.4 Grams/Sec convert to 53.49 Lb/min?

Had her out at the track tonight, was getting some hesitation up top, and over ran the MAF once. Managed to consistently run 12.3-12.4 @ 113-114, but if I can get the hesitations sorted I think high 11's are possible..

wow nice setup I can't open the log because I don't have dsmlink but what do you have your MAFT box base injector set at? If your getting overrun or cut you probably need calibrate a bit, I think your real airflow is close to the 53lb/min but in reality maybe 10% less? Its a 51lb/min turbo so I'd guess with the set boost and/exhaust its near its limit 49-51 range.

I was getting a similar cut with high boost on my 20g and 1000cc setup, turned out the gm maf was seriously over reporting my maf hz, turning the MAFT box injector size up to reduce the reported airflow solved my problem. My airflow was so wacked out I used a 2g maf to calibrate against but you may be able to just get away with turning your size up 10cc at a time until the cut goes away because that airflow is probably close.

 

[Diamond Star Werks]

Oh really? Hmm I must have misinterpreted the value...
Doesn't my logged 404.4 Grams/Sec convert to 53.49 Lb/min?

Had her out at the track tonight, was getting some hesitation up top, and over ran the MAF once. Managed to consistently run 12.3-12.4 @ 113-114, but if I can get the hesitations sorted I think high 11's are possible..

Since the MAF hrtz shown in your log is enough to over the stable max for both 1g and 2g I judged your hp off the amount of fuel you were using. Give or take some to be running 53lbs/min you would need to be using closer to 80% of your 1250cc injectors. I could be alil off (maybe) but not by much.

Injector Size 100% IDC(lbs/min) 80% IDC (lbs/min)

1200cc 67.07 lbs/min 53.66 lbs/min