After decades of throwing upgrades on my 1986 GN it almost seems like it has lost power instead of gaining power. I have upgraded to T44 turbo, a front mount intercooler, ram air kit, 60 lb/hr injectors, larger TB, hot wired 340lph fuel pump, ecuGN, and the list keeps going.All data logs show almost no KR with fueling that's pretty close, and boost at about 20psi in 1st gear and tapering off as it goes through the rest of the gears (18, 16, 14). Instead of being at about 4 seconds 0-60 and 1/4 mile times in the 10's like other Turbo regals with similar upgrades I've seen, I'm now at about the same performance as an early 80's Camaro with the 2.8 V6. Anyone have any idea's what I'm missing?
Lots of upgrades, but still no power.
- Thread starter TURBO2
- Start date
There are so many things that could account for poor performance, but the foundation must be solid to begin with.
List the details of the car, all modifications, is the car the stock engine or has someone been in it?
I would start off with a compression and leak down check. If those look out of line all the mods in the world won't do a thing. If those tests check out the valve spring pressure need to be checked and the list of things to check will go on. But the foundation must be solid to begin with.
The 86 in my signature is an example of a car with a huge list of issues when I started. When the car came home I honestly thought the engine was shot. Zero power, ran terrible, smoking out the exhaust, you get the idea. Turns out a deteriorated fuel system, slipping trans, a roached turbo, vacuum and exhaust leaks, shit ECU chip, bad MAF, bad coil pack, hacked wiring harnesses, and poor grounds will all add up to a terd.
Two years later with the same engine and that list of issues address its a different car and makes good power and drives great.
I've never had it on a dyno.
My Dakota Digital Dash is putting it at;
0-60 in 9.4 seconds
1/4 in 19.3
It's a stock block, never apart with 107,000 miles. I've gone through all the basics and replaced all of the vacuum lines throughout. I have checked all the grounds and added a ground cable from the battery directly to the body and engine block. I replaced the valve springs about 4 years ago with 100# springs. Most everything seems to check out, and datalogs seem good, but the end result is less than spectacular.
Marty Fairchild
Member
- Joined
- May 3, 2013
Man, you have been a member here for twenty years!
Where are you located.
Surly someone is nearby that could help out.
Where are you located.
Surly someone is nearby that could help out.
Yes, I replaced the timing set, oil pump, and water pump.
Pronto
No amount of evidence will ever persuade an idiot.
- Joined
- Dec 9, 2002
I know someone that help you. DM me if you're interested.
ecuGN so it is now speed density.
PATC Raptor
PATC 2800 stall
ecuGN so it's now speed density
IAC and TPS are brand new and right on the money.
The boost is staying up, but just doesn't seem to convert boost to more power.
Exhaust is good
I went with front mount for any future upgrades. It's a GN1 Extreme.
- Joined
- May 28, 2001
What does "seem good" mean?
Post the tune, some short data logs, and the guroos can take a gander...
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