Thanks for that clarification Todd. I guess they unified the solenoids in 89?
Thanks for that clarification Todd. I guess they unified the solenoids in 89?
Couple of points.
1: the video you just posted isnt EXACTLY the test i had in mind because the engine was still at a low enough rpm that it could not quickly spool the turbo at that rpm. For a more accurate result i would try even higher in the rpms while making sure to go from low-load to FLOORED as quickly as possible. To me it still looks like exactly what i was hypothesizing, that there is a boost spike caused by a delay or restriction in the pneumatic circuit between the intake manifold and wastegate 'can'.
2. The leaking you hear sounds like a blow off valve or loose coupler. It does not sound like flow out of the wastegate. So i do think you have more than one issue here, but i think the boost spike is more important to diagnose than the leak at this point.
Dont push the red button.You hear me?
Funny part of this story is the real LT1 is so 1970! I'm sure plenty of the old school guys turn their noses up on the newer LT1's. Don't confuse LT1 with Type LT Camaro's circa late 72-78 turds. The LT1 was the real deal. It took over two decades for later generation LS SBC's to surpass the original performance of the 1970 LT1.
Sorry for the hijack. T-bird 232 must have struck a nerve (lol).
Todd
Well, since I've seen this debated over the forums a few times, I can tell you that the original LT-1 isn't really a better performer by any means. There was an article a few years back where the compared a LT-1 to the LT1, LT-1 being the original, and the numbers were incredibly close. The LT-1 had an electric water pump on it, where the LT1 did not. Considering that guys have picked up about 8-12rwhp with an electric water pump on LT1 cars, I'd say that is a big factor in the numbers.
That is from the article in a Corvette magazine comparing the two.
I understand striking a nerve, but it goes both ways, lol. I get irritated when older guys in muscle cars trash talk newer cars like my 97 Trans Am. They use a similar argument, saying it took all these years to out perform the engines of yesteryear, but you have to consider, in 1970, they had no emissions regulations, no EPA required fuel economy, leaded fuel, and government bearing down financially. Look at the power numbers shortly after. In 75, GM's beloved Corvette dropped to 165 horsepower with a 350.
So it was only the 2nd generation of SBC to meet/surpass the original LT-1. If the LT1 doesn't do a well enough job for ya, look up the LT4. Same engine with different heads, cam and intake.
I too apologize for the hijack. I do enjoy a good debate.
Just to add on my Silverado SS every one calls my motor a SBC. Umm no it is a LS engine. And no offense to anyone here but the lt1 is a horrible motor to build from. The internals are weak. Surprisingly the lt1 only has 2 bolt mains.
[SIGPIC][/SIGPIC]
From what I'm seeing here, it sounds like it's a problem with the wastegate solenoid routing (the piece on the fender well). Assuming the solenoid is functioning (the rarely fail), if the cal and the hose routing aren't in agreement, you could easily end up with just the boost the actuator on the turbo will allow (roughly 8psi).
There are a couple of routing options, TI and TII, unfortunately they are 180* different from each other, and both were used by the factory, but any way you go, the cal and the routing have to be in agreement or you'll not get "what you paid for".
I'm guessing that you routed it to what was shown on the vacuum routing label, but it's in conflict with the custom tune. Correct that and it'll be a whole other animal!
Mike
"The Constitution is not an instrument for the government to restrain the people, it is an instrument for the people to restrain the government - lest it come to dominate our lives and interests." - Patrick Henry
Bad laws are the worst sort of tyranny.
- Edmund Burke
The only time the internals are a problem is if you're going forced induction.They have hypoeutectic pistons and 10.5:1 compression. Most don't recommend going above 5psi of boost on stock pistons.. H/C/I guys in the 10's with stock internals. Got a bunch of guys in the single digits with a non-filled block, 383 stroker with nitrous or forced induction. Very seldom do you see someone blow one up without doing something stupid.
Also, while the LS motor isn't technically a SBC, it still is considered a small block. It's just a different generation.
I and he work on both, that's why I lumped them together.
You mean LT-1 I will take getting 30 mpg to the track and running faster times than the old LT-1
Not all are 2 bolt mains, some years came with 4
it doesn't matter anyways, as the newest LT1 in the C7 puts them all to shame . Except mine >
as as far as trouble shooting the motor, it is on hiatus for a bit. I need to focus on getting my car ready for the year.
Oh, well that's good since i guess it means you arent annoyed about people BSing about old chevys in your 'diagnose my dodge' thread.
Dont push the red button.You hear me?
Any updates on this issue?