disappointment on the dyno

[Pronto]

Maybe you should test the injectors with a noid. One could be flaky. I would backtrack and see what happens. I've see a few other posts lately about issues with 60s and others with the translators.

 

[2QUIK6]

Double check yout Translator wiring too since that was just added. Are the MAF# reasonable looking at cruise and WOT compared to what they were before....they aren't maxxed out at part throttle are they to 255? And likewise should be near or at 255 at WOT...23# of boost should easily max the MAF to 255, or half that if you have an extender chip.
I have the Mototron 60/65# injectors and the T+ and they work fine together. I did have to tweak the AE fueling for tip in quit a bit, but that would have nothing to do with your problem since its not tip in stumble you're dealing with.

 

[OneLethal87GN]

I'm pretty sure I know who you took your car to. He must know something if he runs mid 5's. I wanted to take my car to him but Raleigh is a good drive for me just to do a dyno tune. Like someone else suggested check your MAF readings. Mine just went bad on me and, thinking back, it was causing me problems for a while before it finally went. I thought it was the coil pack or module going out because it would pop and backfire under heavy boost. Then it took less and less boost to start popping until finally it drove like crap just cruising around. A bad MAF can affect a/f ratio if it's giving screwy numbers. Just something to check. I'm not sure which is closer to you Raleigh or Greensboro but I've heard nothing but good things about Turbo Tune. I want to get mine dyno tuned eventually. Good luck.

 

[NCTURBOS]

What you need to do is get together with Sully, Thompson, and myself when we go to the track.


K.

 

[DonnieShort]

What chip are you actually running? Eventhough you can use the Translator with any chip, it will run better with the Extender since it is designed for the Translator. Is your Translator the regular or the Plus? What fuel pressure reg are you using? How old is your fuel pump? What is your static fuel pressure setting, if you have an Extender it is to be set at 45psi line off? How are your BLM's across the board? Do you have any exhaust leaks? When was the last time you changed your fuel filter? Fill use in on all the details of what you have set up wise.

 

[seeyabye]

The chip that is in there now is the extender. I also have a turbotweak chip, but it makes no difference in the way the car runs. I have the regular transalator with the 3" sensor. I have the accufab adjustable regulator(3 years old), hotwired walbro 340(3 years old), and a recent fuel filter(3 mos). When I got to the dyno, I had the turbotweak chip in with 43 psi FP line off. Boost was at 23 psi as recommended, and the alky was on. The first pull af ratio was almost 14 to 1. The guy told me that it was super lean, and thought the problem was in the chip. We replaced the chip with the extender without changing anything else. The second pull was not as bad, but it was still very lean. He then tried adding fuel through the translator, and then the FP reg. On the last pull, he had the fuel pressure at 50psi line off and the translator at 14%rich. The car made the most power, but was nearly undriveable when I left. I had to pull over and change the settings in the translator to get the car to run normally. Lethal, I took the car to Turbo Tune.

 

[seeyabye]

I almost forgot, the car has a fresh long block, new ac delco plugs, and 2 year old wires.

 

[PHANTASM]

one ? noone has asked.

is the wideband sensor the dyno is using working properly.
i have dynoed cars and had them wear out and give a wierd reading.

maybe it is not showing the correct a/f ratio and you are tuning wrong.

i also had a mustang the had the wrong spark plugs in it and even though it ran good it was actually missing and shorting against the sparkplug hole where you couldn't see it according to the dyno sheet.
no matter what the tuner did with the programing it made no difference to the outcome of power.

hope this helps.

 

[TurboDave]

It could be possible the MAF is starting to go bad. I had an LS1 3.5" maf go bad on my a couple years ago. It didn't just up and die, it kinda crapped out over a few month's time, and had some pretty wierd symptoms.

It sounds like a lot of your problems are WOT related. You stated you had to push the fuel pressure dangersously high and crank in a bunch of additional fuel with the Translator to get it up from "way lean" on the dyno, but then said it was running pig rich during normal driving, if I understood properly.
Might want to try throwing a different LT1 sensor at it.

 

[CKBuick]

I have a 3'' sensor you can borrow if you like not to far from you.

 

[seeyabye]

I appreciate the offer, I think I have an extra.

 

[Turbo1dr]

Have you got a new O2 sensor yet? Some one else mentioned that above and that's what I was thinking as I was reading the post. You're blowing a lot of fuel to have any lean mixtures. What about fuel pump/voltage problems at WOT???

 

[seeyabye]

I replaced the o2 sensor just before going to the dyno, I imagine the fuel pump has plenty of voltage because I have plenty of fuel pressure. This thing is killing me!

 

[JDSfastGN]

hmm im lost on this one, but possible check for a bad ground on the back of the head? I have seen this cause low 02 readings which may make things a bit screwy.

 

[BarnesGN]

I dynoed at Turbo Tune and my readings were lower than expected. My torque numbers were waayy off like 370 on a bolt on car.

You really need to talk face to face with some knowledgeable local Buick people like LOOK QUICK. Piedmont is about 30 minutes south of your localtion and should be no problem getting several people to check things out for you.

BTW Check the southeastern section for other board members.

PM me and I'll give you my phone number if you like my dyno experience.

 

[seeyabye]

Well, it wasn't the maf sensor. I swapped in a known good unit and still have the same problem. I turned the boost down as far as it would go (20psi), lowered the fuel pressure to the recommended 45psi, and changed the settings in the translator back to normal idle settings. I left the translator 12%rich, but I am still having the same problem. o2s are in the 680-690s. I did notice that the scanmaster only shows af at 146 wot. How is this possible? Both sensors read the same thing, and both read fine on the other car. Could my translator be bad?

 

[Turbo1dr]

Time to check your gauges with another set of gauges.

 

[TurboDave]

Well, it wasn't the maf sensor. I swapped in a known good unit and still have the same problem. I turned the boost down as far as it would go (20psi), lowered the fuel pressure to the recommended 45psi, and changed the settings in the translator back to normal idle settings. I left the translator 12%rich, but I am still having the same problem. o2s are in the 680-690s. I did notice that the scanmaster only shows af at 146 wot. How is this possible? Both sensors read the same thing, and both read fine on the other car. Could my translator be bad?

You stated earlier that you had an extender chip. This will display MAF readings that are about half the actual flow values. That's how it "extends" the MAF's capabilities to beyond 255.
The 146 (146 doesn't sound bad, that's an actual maf flow of about 292) readings have nothing to do with the Translator, but it's possible it could be the problem, or wired wrong.

 

[SloGN]

Sharif

Sharif


i don't really think your car is off that much honestly. I had my car dynoed at the same place @ 20 psi of boost and 21 degrees of timing with all the mods down below i only pulled 350 @ the rear wheels. so i think that respectable for a bolt on engine combo.

Also sharif get the car tuned some what and take it back with race gas in the car. alcohol is nice but it's not like race gas. injecting to much alky can the car lazy.

when i dynoed my car i done some testing.while at 20 psi of boost with race gas tring to tune the car i got the tune where i wanted it A/F wise. then on my last pull i turned on my alky to pump speed # 4 where it runs on the street for 20 psi. when i made a pull with the alky injecting on top of the race gas. the car lost almost 15 hp thats a lot of power. so i will say it again there is no replacement for race gas when wanting max HP.


hey guys will the fact it has a 350 trans and big convertor with more slip cause the #'s to read low?

 

[SloGN]

I dynoed at Turbo Tune and my readings were lower than expected. My torque numbers were waayy off like 370 on a bolt on car.

You really need to talk face to face with some knowledgeable local Buick people like LOOK QUICK. Piedmont is about 30 minutes south of your localtion and should be no problem getting several people to check things out for you.

BTW Check the southeastern section for other board members.

PM me and I'll give you my phone number if you like my dyno experience.

why would you think your torque is way off you pulled more than he did something like 370 TQ thats more that sharif with less mods on the car.



shairif - i have seen a stock unopened 100k motor go 6.90's @98 mph with a te-45a and supporting mods but he had to run the boost @ 30-32psi to get it there.

with out heads on the car your gonna have to run big boost #'s to over come the small heads.