4agze lag?

[Kevin mr2 1985]

okay my car is acting like it has a turbo on it, and its a supercharged 4agze... any ideas? it will spool up to 9psi but only if i slowly increase in the amount of throttle i put on... so if i just slam on the gas it doesn't go nearly as fast. any ideas?

[ebouwman]

could it be an issue with the way the supercharger was wired in? Cause they have a little clutch right?

[CpuZapper]

Check your belt tension on the SC. Also, your ABV may be leaking.

[ebouwman]

tps maybe? Because if it was off then it may be running the wrong mix when at full throttle.

[NONACK]

Do you mean that the boost increases only with rpm? That's normal, as SC boost is proportional to engine speed. It's not going to make 10psi at 1000rpm.

[ebouwman]

Originally Posted by NONACK

Do you mean that the boost increases only with rpm? That's normal, as SC boost is proportional to engine speed. It's not going to make 10psi at 1000rpm.

Re-Read the post

Originally Posted by Kevin mr2 1985

okay my car is acting like it has a turbo on it, and its a supercharged 4agze... any ideas? it will spool up to 9psi but only if i slowly increase in the amount of throttle i put on... so if i just slam on the gas it doesn't go nearly as fast. any ideas?

[NONACK]

I know what he said, but none of it suggests where in the rpm range he is having a problem. My post was simply suggesting that if he "just slams on the gas" at low rpm that does not mean that the boost should jump right up.

[ebouwman]

He says that it only reaches 9 psi if he slowly presses the gas. So he implies that if he slams the gas it never reaches 9 psi, that's what i read into it.

He also says that he goes faster when he doesn't slam the gas, and that would kind of suggest a problem to me.

Kevin, do you have supercharger gauge cluster?

[88"s/c lil"bastard]

sounds like my 4agze, i think its how the car like to be driven its not big on torque although the 4agze does have a good amount but certainly not in the low end. hows your ignition ? anything new like a coil? , wires?, just curious.

maybe you may have more momentum when your steadily accelerating weaving curves

if you haven't checked the belt don't count it out, but don't over tighten

[Kevin mr2 1985]

okay i will check tension, and i dont believe its wired wrong... i could be wrong. I have a boost guage. and the tps is connected, iwth a 4age throttle body. no ignition changes what so ever. Also if i just do the abv mod i dont have to worry about the abv leaking correct? cause i believe thats what im going to do.

[Jackstand Queen]

If the ABV is malfing, the cutout mod will not necessarily overide the malfunction.

If you're cruising along at over 3000 RPM's, and you stomp the pedal, you should go to near maximum boost instantly. However sometimes an elusive last single PSI comes in a couple thousand RPM later.

I forgot something about your setup, do you have an oversized main pulley? Because if you do, 9 PSI is way too low a number to be expecting.

[Kevin mr2 1985]

no nothing is different all stock, except for oversized throttle body. and could i merely block off the hose from the supercharger, and the metal part that bolts on? also could the lack of vsv's be a reason why its not running amazing yet?

[Jackstand Queen]

I've read on these forums that people remove the ABV altogether which causes the Sc to run fulltime. I guess it would tend to idle high as a result, and decrease the long term lifespan of the SC. In the short run though, no problemo.

9 psi isn't bad with the stock SC12 and main pulley. I wonder if the N.A. TB Mod. adds boost or not. Seems like it ought to. When I get mine running good, I'll let you know.

Mine's back up on jackstands AGAIN! The SC seems like its not turning over smoothly. I'll rip it out and look at its guts and see what's wrong this week.

[328FTW]

I removed the ABV completely and it improved the SC pickup and throttle response which was nice but yeah I wasn't worried about longevity which brings me to my next point....

(Quick threadjack here) I was going to leave this as a vistors message on your page jackstand but forgot and now I'm here and remember I will post it up. I found the problem with my blown 4agze that was so nicely modded. I pulled it down a couple days ago and the silvertop pistons I put in must have been cracked because one of my pistons ring landings was absolutely shot and shattered, I was surprised to find no bore damage. When I pulled it out this bits of stuff came up then rolled across the floor and then I looked at the piston and yeah it was destroyed. So the theories about what may of caused it kinda go out the window because I am pretty sure it was a cracked piston. Anyway forget about my intervening and carry on.

[Kevin mr2 1985]

so you just capped off the abv completely? an how? pics please?

[328FTW]

I blocked it like this, just an aluminum plate with a little gasket I cut under it. Then I took off and poured resin in the other pipe to seal off the pipe. Also n/a throttle body modded without having to 180 the tps because of it.

[Kevin mr2 1985]

very nice what if i was able to connect the black hose and the metal pipe so the air could flow through the system still? and is your boost good?

[328FTW]

I don't have a boost gauge so I can't tell you if it made any difference but it still boosted so it worked, the engine was almost stock otherwise so I think it just eliminated another unused system. No air actually needs to flow that was kinda the point of doing it, the abv was venting boost to limit it.

I still wonder if it will damage my engine, it shouldn't since the abv was modded anyway to do nothing but there is always that "what if...." in the back of my mind.

[Kevin mr2 1985]

well im going to do that some time soon and ill tell u if anything changed i have a boost guage. also where is the oil pressure guage like where does it plug in?

[328FTW]

If you mean the oil sender on the block it is under the distributor next to the oil filter. But I'm not sure if the levin just ran an idiot light in which case that will probably be somewhere else. Here is a pic of the one of the original mr2 engines.