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Why is my.. Top swapped car so damn slow?

I've gone over everything and didn't find anything too bad. The injectors aren't stock. You can see the heat shrink where someone soldered in new injector clips.. At least the **** was soldered. Leaves hope for the future.

I may be able to swing a trip to highway. Haven't been there in years.
 


Re: Why is my.. Top swapped? car so damn slow?

I'm going up Friday for sure, not positive on Saturday yet. If you end up going let me know and we can meet up.
 
Re: Why is my.. Top swapped? car so damn slow?

Thats a lot of WOT timing for pump/high comp bottom end.

Not saying its bad, but you could probably drop pulley size.

However you probably should figure the lack of boost issue first.
 
I'm gonna look into my lack of boost issue prolly next week. Can I close the boost bypass valve and do a boost leak test like on a turbo car?

I don't know too much about timing or tuning, so in that aspect I have a lot to learn. What does everyone else run for timing advance?
 
Re: Why is my.. Top swapped? car so damn slow?

Can't really pressure test a supercharged car.

Just remove the lower hose from the bypass valve (BBV) actuator and cap it on the solenoid. Leave the lower nipple on the BBV open to atmosphere. That'll leave vacuum bypass in tact, but remove the traction control function. In other words turn off traction control if you anticipate wheel spin until you reconnect that hose.

You can go higher, but you're risking your head gaskets.

Not recommended to go much lower than 16 though.
 


Re: Why is my.. Top swapped? car so damn slow?

matt5112 said:
When timing locks at 18.5, it really sounds like hes going WOT.

You guys...
Click to expand...

lol i realized he was doing 50 in the vid right after i posted that then i deleted it lol didnt wanna sound stupid too late haha
 


Ok. Had some time today to look at the car. Turns out the electrical solenoid that runs to the boost bypass valve wasn't plugged in nor was there a plug for it. So I disconnected the bottom vacuum line. Car feels way better. But now I have kr. So I would imagine the boost went up (still haven't hooked up the boost gauge) but the kr scares me. I wanna say it hit 10 on a downshift. So looks like I have to order me some headers like yesterday.

If I order headers does that take care of the u-bend delete? Or is that a seperate mod? I'll also need the o2 extension harness correct?
 
Re: Why is my.. Top swapped? car so damn slow?

Yes headers will take care of the u-bend. Now another issue you may come across is majority of them don't come with cats. If your state has emissions testing, grab yourself a cat to put on there. Read the header thread, offers a lot of insight on headers. And since I did not see what year this vehicle was, 04+ need to have the O2 harness extended. If you are tech savvy, cut the wires and extend the harness yourself. I did it with some heat shrink tubing and soldering iron. Pretty simple.
 
Re: Why is my.. Top swapped? car so damn slow?

NegativeOne13 said:
Yes headers will take care of the u-bend. Now another issue you may come across is majority of them don't come with cats. If your state has emissions testing, grab yourself a cat to put on there. Read the header thread, offers a lot of insight on headers. And since I did not see what year this vehicle was, 04+ need to have the O2 harness extended. If you are tech savvy, cut the wires and extend the harness yourself. I did it with some heat shrink tubing and soldering iron. Pretty simple.
Click to expand...

They have emission testing in my state but I registered the car somewhere they dont require me to test so that shouldnt be an issue. Will I have a check engine light since there wont be a cat? The o2 emulator ( I forget where I saw it (w-body store?))will fix this right? I am very experianced with a soldering iron so I am very capible of making my own o2 extension harness (if required), Assuming its nothing more than just extending them. 10* of knock retard seems like alot to me. Should I remove the supercharger belt till I get a set of headers? For people coming into this thread late, this is a 2001 gt with a top swap. Man, you guys are helpful as hell..
 
Re: Why is my.. Top swapped? car so damn slow?

IIRC the ZZP tune should have the light disabled. Then again someone with a ZZP tune would know. So if that is the case, not emulator is needed. And I would remove the belt as a precaution. Days without a blower is cheaper than a new engine. Not unless you can control yourself good enough, but better to be on the safe side. And as previously stated find a local member who knows what they are doing when it comes to tuning. A top swapped car needs a custom tune, not a canned tune let alone ZZP.
 
I would setup the solenoid as it was before and run 3 psi again. At least you can have some boost in th mean time.

The aero can check boost. Setting is called map in hg/psi.

You will probably want a cat or at the least, keep your rear o2 sensor because you have a 2001. They like to run a cat diagnostic that dumps fuel killing fuel economy if you dont leave the rear o2 in place.
 


Re: Why is my.. Top swapped? car so damn slow?

matt5112 said:
I would setup the solenoid as it was before and run 3 psi again. At least you can have some boost in th mean time.

The aero can check boost. Setting is called map in hg/psi.

You will probably want a cat or at the least, keep your rear o2 sensor because you have a 2001. They like to run a cat diagnostic that dumps fuel killing fuel economy if you dont leave the rear o2 in place.
Click to expand...

I had no intention of deleting or eliminating any of my o2's. I just didnt want to run a cat. Im use to pre 95 cars and some of this is somewhat new. If I can get away with not having a cat id like to.
 
Re: Why is my.. Top swapped? car so damn slow?

I'd recommend a real tune for the car... Get some headers on there as well. You'll pick up good power :)
 
A real tune will come with time. I'm In slightly over my head and would like to have a general know how when it comes to tuning before I want some to mess with my ****e. Not to mention any financial hold ups. Ill spend $600 on hptuners (or equivilant) and another $210ish on headers. I'll get the headers ASAP and work on a tune after that.
 
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