Blitz Access ECU

Re:Blitz Access ECU (MuMan)

Thu, 29 Nov 2012 14:16:58 GMT

Old thread, but thought I'd toss in a few thoughts.
The Blitz Access did come in a custom tune option, but from all reports back then, it was very scarce, and marked accordingly on the ECU. The stock version dyno'd out to a 45 PS power increase on 100RON; I do have the dyno specs somewhere if anyone is interested.
The main changes were, apart from the fuel/speed cut, 17 psi boost and RPM limit, confined to a re-mapping of the ign advancve curve, and surprisingly enough, a very limited amount of change to the EFI. This was confined to the very upper range of the high boost map, and although extensive in magnitude, limited in range.
Still have both maps I think, but in a previous computer.
You need to run 100RON or an ethanol mix to get the most out of it. On 98 you'd be better to drop static advance back a couple of degrees to keep the advance curve useable.

Re:Blitz Access ECU (Engineering_guy)

Thu, 01 Nov 2012 21:36:42 GMT

What is this AFM mod that is mentioned earlier?

Re:Blitz Access ECU (Admin)

Thu, 01 Nov 2012 06:16:51 GMT

I didn't put it on the dyno though it definitely gave the car more grunt.

Re:Blitz Access ECU (capitano)

Thu, 01 Nov 2012 00:03:28 GMT

Did that ECU ever end up on the dyno?

Re:Blitz Access ECU (EssDub)

Wed, 11 Jul 2012 10:06:28 GMT

The mid-range improvement would have been from the engine not drowning in fuel, lol.

Re:Blitz Access ECU (MRTurbo)

Wed, 11 Jul 2012 09:57:21 GMT

Anecdote from a ST185 GT4 owner:
Installed the Blitz Access ECU today. It took it a while to get the AFR's to 14.7 at idle. I pretty much babied the car until it started running smoothly. The car runs leaner at lower boost pressures. At 5psi at partial throttle it's still running 14.7. At WOT and 15psi the AFR still hits a little over 10 in the upper rev range. I didn't get much seat time today but it feels like the midrange has improved. Before on the JDM ECU it would run 11ish AFR at 5psi even at light throttle. If you followed with a quick jab to WOT it would plummet below 10. I really need to get this thing on the dyno. I've heard the Blitz is tuned for 100 octane but Japan uses a different method of calculating it. I think 94 octane is the US equivalent. Of course I run 93. I need to get this thing on the dyno.

Re:Blitz Access ECU (MRTurbo)

Wed, 11 Jul 2012 09:25:02 GMT

EssDub
I'm going to call BS on the 'custom' tune, based on the following observations. Most of the PnP ECUs available from the likes of Blitz, Sard, HKS etc. were just tuned ROMS with more aggressive IGN timing and slightly better fuel maps, no speed/fuel cuts and a higher RPM limiter (around 8000rpm IIRC) and were intended for use on stock (or mostly stock) engines. The common factor between them all was the requirement of premium grade fuel (like the 102? Octane available from the Japanese pumps).
Back in the early 90's, custom tunes for the end-user would have been left to the likes of the Piggy-back Fuel computers like the HKS FC and suchlike.

Many people ran into issues with them when they changed things like the turbocharger, boost pressure, timing (distributor), fuel system or electrics. I've seen several cars with PnP ECUs from the 90s start detonating and reverting them to standard issue ECUs fixed all the problems.

I did a lot of research when I was looking at getting one and I did hear about this 'custom tune' thing, but no one actually knew where this info came from. Yes they were intended for use with basic 'bolt ons' only, like exhaust and air filter etc and premium Jap fuel (not the swill in Aus). Hence, I wasn't going to blow $500 to find out.
Hope "adisco" does this back to back test on a dyno with the stock ECU to reveal whats really going on, rather than just anecdotes.

Re:Blitz Access ECU (EssDub)

Wed, 11 Jul 2012 09:03:56 GMT

Not so.

If you look at the properties of Ethanol-based fuels, you would note that unless you significantly increase the amount of the fuel going into the engine, you will achieve nothing other than leaning the car out. Combine that with increased ignition advance under load and you have a pretty good recipie for detonation.

MRTurbo you'd want to be running ethanol/race gas to really reap the benefit.

Re:Blitz Access ECU (EssDub)

Wed, 11 Jul 2012 08:58:48 GMT

I'm going to call BS on the 'custom' tune, based on the following observations. Most of the PnP ECUs available from the likes of Blitz, Sard, HKS etc. were just tuned ROMS with more aggressive IGN timing and slightly better fuel maps, no speed/fuel cuts and a higher RPM limiter (around 8000rpm IIRC) and were intended for use on stock (or mostly stock) engines. The common factor between them all was the requirement of premium grade fuel (like the 102? Octane available from the Japanese pumps).
Back in the early 90's, custom tunes for the end-user would have been left to the likes of the Piggy-back Fuel computers like the HKS FC and suchlike.

Many people ran into issues with them when they changed things like the turbocharger, boost pressure, timing (distributor), fuel system or electrics. I've seen several cars with PnP ECUs from the 90s start detonating and reverting them to standard issue ECUs fixed all the problems.

Re:Blitz Access ECU (Admin)

Tue, 10 Jul 2012 19:22:07 GMT

I've been told that the Blitz ECUs were set up to customers specifications, so you cannot compare two Blitz ECUs. The lower power figure with Blitz was probably because your mods didn't match the tune in the ECU.

Re:Blitz Access ECU (adisco)

Tue, 10 Jul 2012 16:04:25 GMT

gained 8kw when you went back to standard ecu? Lol ok

Ill do a dyno run standard ecu v blitz. That way i have a dyno graph to prove my case. But at the end of the day as long as im happy who cares.

Re:Blitz Access ECU (MRTurbo)

Tue, 10 Jul 2012 10:39:30 GMT

You mean ECU Graham? lol
Glad you confirmed this.
I was going to get one ages ago but I'm very skeptical about the gains, plus the fact they're not exactly cheap. It IS supposed to have a more aggressive ignition table but considering even the stock JDM ECU pings on 98 (apparently), you'd want to be running ethanol/race gas to really reap the benefit.

Re:Blitz Access ECU (EssDub)

Tue, 10 Jul 2012 10:29:51 GMT

The Blitz Access ECU does Sweet FA. Ran one in my GT-S Turbo in NZ and actually lost power, due to it advancing the timing something fierce and not even 100 octane would stop the det. Went back to a stock ECU and gained 8kW over basically the entire curve O.o

Modding my AFM provided larger gains and was more reliable :P

Re:Blitz Access ECU (MRTurbo)

Tue, 10 Jul 2012 10:10:01 GMT

Just 'leaned' mine out for free on the w/e. Midrange pulls much harder now. AFM mod FTW. :D

Re:Blitz Access ECU (MRTurbo)

Fri, 06 Jul 2012 18:48:12 GMT

I agree that standalone plus tuning/dyno time gets exxy very quick. But the Map ECU isnt a standalone its an interceptor to the stock ECU that basically allows you to have full control of it. Tuning is done by an easy to use GUI and linked with a wideband allows easy tuning. The unit is not much more than a Blitz too.