Question for Dee

[Doogz]

Hey Dee, I was thinking of running a 46 trim T3/T04E (if i can find one) or i could just get the 50 trim as it is easily available for a low price. But my question has to do with the lag your setup has and not the boost threshold. Much talk has been made of when it spools (4k'ish) which is absolutely fine by me. What i want to know is when you are in high rpms, if you were to let off the throttle and then stab it real quick...does it build its boost back fairly quickly?

I love to autox but i don't want a little girly turbo either As long as boost comes back fairly quickly when you are within the boost threshold then i'll have no problem autoxing on this turbo.

Thanks, Ryan

[boost_boy]

Quote »What i want to know is when you are in high rpms, if you were to let off the throttle and then stab it real quick...does it build its boost back fairly quickly?[/quote] Yes! The power is there when you get in to it. Don't get the .63 housing or you will be sorry. I just installed my 60-1 with a .60 front and a .63 rear housing just to drive my g/f's car home because her turbo is getting rebuilt and with the 60-1, the car built 10psi at 7000rpm. I'm going to check the car tomorrow to see if there's some kind of leak or something because I do know the 60-1 comes on at around 4800rpm-5krpm, but this thing was nastily laggy. How much power are you looking for?

Dee

[Doogz]

Well, i'd like to hit 300 to the wheels at 15psi but who knows if that'd happen or not. The main thing holding me back from selecting a T3/T4 is finding a decent manifold for a fair price. However the bolt on T25/28 options don't seem worth pursuing unless you buy a $2000 turbo, that if it ever blew up i'd end up crying for 3 months.

[boost_boy]

Quote »However the bolt on T25/28 options don't seem worth pursuing unless you buy a $2000 turbo, that if it ever blew up i'd end up crying for 3 months.[/quote] If you're referring to the ball bearing units, you're right. But even the ceramic units will scar you too......... If I were you and looking for just 300, but wanting a bit more spoolability, I'd select a T3/T04B stage III or a T3/T04E stage I or II.

Dee

[Doogz]

This is the other option i have been pondering...Its a T28 that is fairly cheap, would spool quickly and would just start to run out of gas in the high rpm range.

Turbo

Compressor map

That appears to be the right map (i think).

If i could run that at 15 psi all day and get 250+ to the wheels then i'd be happy as it'd save me some money and a lot of work getting the T3 to go on.

[boost_boy]

With the proper tuning, anything is possible! And i'm pretty sure that at 15psi and on that turbo, you should be pretty close to that goal if not exceed it.

Dee

[Doogz]

Sounds good. Thanks for helping me sort some of that out cuz it was really buggin me. Hopefully i'll finish all of the suspension and brakes this year and start saving up for the engine bits for the following year. You better still be selling SDS's by then

[boost_boy]

Quote » You better still be selling SDS's by then [/quote] By that time I'll have a static program set-up for most big injectors. I'm testing from 370cc to 96 lb/hr and so far I'm up to the 72 lb/hr injectors. Just need to go the dyno and see if the highway tuning is spot on or within a 10% radius. But rest assured, if you need one, I can square you away.

Dee

[Doogz]

you slacker! By that time you should have a satellite link-up system to where you could remotely help install it from anywhere in the world

[boost_boy]

Quote »you slacker! By that time you should have a satellite link-up system to where you could remotely help install it from anywhere in the world[/quote] It's gonna be that long:D ! Satellite link-up? We all wish.......

Dee

[biosehnsucht]

Sometimes highway tuning means more than dyno tuning, as you'll have more load on the highway (pushing against wind etc not just rollers) and its possible for a "perfect" dyno tune to lean you out.

[boost_boy]

Quote »Sometimes highway tuning means more than dyno tuning, as you'll have more load on the highway (pushing against wind etc not just rollers) and its possible for a "perfect" dyno tune to lean you out.[/quote] I agree and that's why I chose to tune for hours on long stretches of unincorporated road because it's more real time with atmospheric and barometric pressures. The dynomometer is a good reference, though!

Dee

[biosehnsucht]

that and the dyno gives you something to brag about

[boost_boy]

Quote »that and the dyno gives you something to brag about [/quote] Right;)! But the dyno have caused a lot of people to have their vehicles to be towed home:) (Bummer). I can honestly say that I've driven away from the dyno after 350+hp pulls on a stock headgasket and even to and from the track after running 20+psi of boost. I guess we could say it says a lot about the tuning, the driver and the CA18DET. They're all good to go:D .......

Dee

[biosehnsucht]

when I'm getting my motor running, I'll start with math tuning (i.e. if stock fuel map etc is this, and I've changed X Y Z, then I should adjust like so) and then after making sure it doesn't blow up idling and driving around the neighborhood, do highway tuning. I'm really thinking about getting a wideband to help do it too.. I wish I had the time to construct the equipment I want.

Then eventually to the dyno, to make sure I don't blow up there either, and make sure I'm tuned to survive both

[boost_boy]

Survival is the name of the game! My built is designed for all or nothing. I will have the fastest CA18DET powered car in the U.S. or blow-up trying. So far I think I've gone the fastest @ 173mph on the highway, but we'll see if I can survive my own goal as well.

Dee

[biosehnsucht]

more power to you - my balls ain't THAT big

I wanna see you go that fast or faster - but not from the passenger seat

[quest]

fp big28 made 335 wtq on a stock sr with lotsa midrange. Lately their website revealed that they actually use gt wheel to build em. Not a bad bolt-on turbo.If you're going custom header, consider a brand new, complete evoIII 16g. Hard for any $550 turbo to match its great response AND topend. When you're ready to upgrade, no need to change the manifold. Go wild with a 20G or other dsm proven hybrid.