tuning help (with dm|)

[H-TOWN-TYPHOON]

http://home.houston.rr.com/akimje/dm files/HRP_Ty_1955_7-14-06.uni

This truck has the big 20g, 36lb injectors, conley/atr big intercooler + exchanger, and other misc bolt ons along with the conley/atr chip. Good ignition system that works properly, etc. My biggest problem with it is how sloooooooow it is. Currently it has a stock converter in it, which I know holds it back, but 14.7 is unacceptable to me. Since there is no real knock, I should be safe to fiddle around with the fuel pressure, correct?

I am currently hoarding money to jump head first into the tuning programs being developed along with alky/2800-3000 stall. I think that my biggest gains will be found there, but am trying to figure out what to do in the mean time.

My last truck ran 14.20 in stock trim and I can not figure out where to go next.

 

[0966Sy]

Re: tuning help (with dm|)

Stay away from the alky untill you get it running right. I'd suggest getting a wideband system before spending any money on alky. I dont think the conley chip is worth the plastic it's coverd in. Do a good solid tune-up with known good wires, cap and rotor and Ngk ur5 plugs or stock ac cr42ts i think. While your in there do a compression test to rule out any mechanical problems with compression/performance. If it's got a adjustable fuel pressure regulator, go ahead and get a good fuel pressure guage. An electric autometer in the cab works best for watching fuel pressure per boost level. I'd assume conleys put a walboro pump in the truck. The best you can do with a 2 bar chip is run no more than 15psi boost. And find the sweet spot for fuel pressure to get a good afr at idle and wot driving. as for going with any more boost than 15 psi with a 2bar your pissing in the wind not supplying enough fuel for past 15psi. Conley's believed you could just crank up the base fuel pressure to compinsate. Well, how come you only think they went 11's a few times before blowing there motor.

 

[Quickstop [UK]]

Re: tuning help (with dm|)

Stay away from the alky untill you get it running right. I'd suggest getting a wideband system before spending any money on alky. I dont think the conley chip is worth the plastic it's coverd in. Do a good solid tune-up with known good wires, cap and rotor and Ngk ur5 plugs or stock ac cr42ts i think. While your in there do a compression test to rule out any mechanical problems with compression/performance. If it's got a adjustable fuel pressure regulator, go ahead and get a good fuel pressure guage. An electric autometer in the cab works best for watching fuel pressure per boost level. I'd assume conleys put a walboro pump in the truck. The best you can do with a 2 bar chip is run no more than 15psi boost. And find the sweet spot for fuel pressure to get a good afr at idle and wot driving. as for going with any more boost than 15 psi with a 2bar your pissing in the wind not supplying enough fuel for past 15psi. Conley's believed you could just crank up the base fuel pressure to compinsate. Well, how come you only think they went 11's a few times before blowing there motor.

Absolutely....

I am about to get into the tuning side as well and it sounds like you have some more things to get:

AFPR
Electric Fuel Pressure Gauge (Autometer do some good ones)
Fuel pressure sender kit (don't mount the gauge on the schrader valve on the rail)
3 Bar MAP
Wideband O2 sensor + AFR Meter (Innovative LM1 perhaps?)
Check the fuel pump

You didn't say what tuning setup you plan to use? Tunercat/ Tunerpro?

A really useful thing to read is Jeff Scott's tuning 101. Make sure you read that. I get the impression a lot of people try tuning by just upping their fuel pressure - should not be the case.

http://www.syty.net/forums/showthread.php?t=36086

Read the boost one as well.

http://www.syty.net/forums/showthread.php?t=36098

good luck

 

[JSM]

Re: tuning help (with dm|)

Couple things to keep in mind.

80% of the ET is in the first 60 foot.
If in the first 60ft your chip is rich, your spool up will be horrible, and the 60ft will suffer.

It is common for people to want to put more convertor in to help spool. Sometimes that is the case, often times I find the trucks are not tuned properly.

Wideband's are one of the best tools you can use as a new tuner to determine what is going on. Even if you don't tune yourself in order for someone to custom tune for you, or help with questions it will be a great help. Additionally I have also heard rumors of some trucks running the new code getting 20mpg or more but it requires a wideband.

 

[H-TOWN-TYPHOON]

Re: tuning help (with dm|)

So, I take it the best thing for me to do right now is just leave it be?

It has a recent tune up
I have a afpr & gauge

I guess the advice given is to wait on wideband/tunerpro before any "fiddlin" commences.

Besides that, did anyone look at the datamaster? It seems that it is running super safe, correct?

 

[ashman]

Re: tuning help (with dm|)

looks like you boost launched @ ~1-2psi and your 60ft time was 2.408. try lauching harder and see if that helps.

 

[turbodig]

Re: tuning help (with dm|)

So, I take it the best thing for me to do right now is just leave it be?

It has a recent tune up
I have a afpr & gauge

I guess the advice given is to wait on wideband/tunerpro before any "fiddlin" commences.

Besides that, did anyone look at the datamaster? It seems that it is running super safe, correct?

I wouldn't say that, although it's tought to tell for sure without a wide-band.

My impressions:
(Aside from Darth Vader and Bullwinkle)

It's probably too lean. Again, tough to tell where your stock o2 likes to run.

Your ignition appears to be ok, although with boost only from 12-14 psi it's not really getting pressed too far.

There's paltry little timing.

Soft launch.

Waaaay too hot IC temps.

This is actually less aggressive than the stock chip. I'm guessing it's being run at a boost
level of less than what was intended.

More fuel pressure (+10 psi base), and a couple more turns tighter on the WG rod. Also
a can of xylene in your tank for octane. Keep in mind, the 10psi of FP will only move you
like .2 AFR, so if you're off by more than that (and most are), it's like sawing down a redwood with a swiss army knife.

Between the timing, the boost, the heat, and the launch, there's probably 2 seconds to be had. (Assuming good octane) This is where the tuning comes into play.

Hope that helps...

 

[H-TOWN-TYPHOON]

Re: tuning help (with dm|)

Waaaay too hot IC temps.

Yeah, I soon discovered that my intercooler pump had taken a dump. Already replaced with a Johnson.

a couple more turns tighter on the WG rod.

The truck has a deltagate on the crossover with a mbc in the cab. My assumption (and main reason for asking questions) was that I could add in some more boost along with fuel and be relatively safe. Just wanted to get some "experienced" input from you guys beforehand.

How can I identify a 2 or 3 bar? Is it noted on the map itself or do I just guess?

The reason that I ask is my in cab boost gauge reads a pretty solid 17-18lbs during a run. When read through datamaster, stock map reads 14lbs and when switched to 3bar it reads ~20lbs. Neither of those readings are what are displayed in cab. How do I troubleshoot/isolate/whatever to get to the true boost readings?

 

[turbodig]

Re: tuning help (with dm|)

Yeah, I soon discovered that my intercooler pump had taken a dump. Already replaced with a Johnson.



The truck has a deltagate on the crossover with a mbc in the cab. My assumption (and main reason for asking questions) was that I could add in some more boost along with fuel and be relatively safe. Just wanted to get some "experienced" input from you guys beforehand.

How can I identify a 2 or 3 bar? Is it noted on the map itself or do I just guess?

The reason that I ask is my in cab boost gauge reads a pretty solid 17-18lbs during a run. When read through datamaster, stock map reads 14lbs and when switched to 3bar it reads ~20lbs. Neither of those readings are what are displayed in cab. How do I troubleshoot/isolate/whatever to get to the true boost readings?

Get another gauge as a reference... judging from the performance, I don't think it's likely that you're actually getting 17-18 psi.

I'd check for leaks in the plumbing to the MAP sensor, also.

If you had a 3bar MAP and an ATR chip, it wouldn't run as well as it does.

Make sure you don't have any kinks or tight spots in your IC lines. The johnson pump doesn't have the capacity to circulate when there's a pressure drop in the system.

Later,

 

[UR50SLO]

Re: tuning help (with dm|)

According to your DM file.. you left the line with 2psi and did not reach full boost of 20psi till you were at 32mph!!! Somthing's not right there...

It also kept getting knock and getting the DTC error ALOT. Boost spiked once for some reason.
What's the DTC error about? I'm usto turbo buick's and I'm new to DM too..
I'm looking at it with the 3bar map
Any progress since the last pass? Pump help?
~Scott

 

[H-TOWN-TYPHOON]

Re: tuning help (with dm|)

I have not been back to the track yet, but I immediately noticed that the engine was considerably cooler after the ic pump was up and running.

The knock and DTC are related (I think). The laptop that I was using ran out of batteries sometime between the traps and pulling back into the pits, so my assumption was that the errors occurred due to the computer crashing.

 

[SBNova]

Re: tuning help (with dm|)

Check this post for GM Map sensor ID's

http://www.syty.net/forums/showthread.php?t=37016&highlight=map