Need Advise/opinion on KA-T?

[Silviapower]

First of all I've use the search function.

Anyway I need all the KA-T geeks attention because I'm already set to go for a swap, an S14 SR to my 98 240sx. I'm almost at the point of no return, so bare with me here. I live in Socal where the damn CARB existed, I already have the smog hook up so thats answered the question of the OBD2 BS. Once in a while I think about the Greddy turbo which is CARB exempt. The Turbo kit is good for 400HP so thats good. But anyway I don't like the idea of a STOCK KA with a turbo.

So what do I need to change on the stock KA head and block to have it safe for maxing out the Greddy Turbo kit?

I also want the head to go as far as 7000/7200RPM?

BTW I am leaning toward the SR so this is really a hard decision. The thing I like about the SR is its smooth delevery of power, no abrupt power/torque. So to this effect I'm going with a JWT cams on the KA for smoothen out the torque on the low end then make power on the top end as mentioned on a topic posted here in this forum.

BTW also my budget is same as the entire SR SWAP at about $6000 minus the turbo $3500 on the motor.

So please..... straight answer only. No banging.

[Structure240sx]

the stock head is just fine for your goals

on the bottom end the only thing you would need are forged pistons

[Red-KAT]

I was talking to a guy that's done a lot wit the 20G turbo's and he said you are better off going with a t3/04 for the 400hp range... The good thing is the 20G and T3/04 use the same flange... But any larger turbo with the Greddy Manifold WILL hit the power-steering reserve.

I have the kit.

Also if you are looking to upgrade your exhaust you will need to add a external waste-gate to the system. and because its a cast manifold its better cost to just have a new log Mani made for the setup then weld it on... I put my name on the waiting list to have them custom make a full tabular Mani and down-pipe for my setup...

Also the kit comes with 370cc injectors... so for 400hp you will need to run MASSIVE fuel pressure or upgrade the injectors again...

All in all this is a Kit to buy and leave alone... If you want more power then build your own kit or get a Boost Designs kit...

I'm sure I will run into more issues with this kit soon.

(The best way to learn is make mistakes.)

EDIT: Right now I am having a Tial 38mm Waste-Gate added to the cast Greddy Mani... This should work out for a little while... We will see how long it takes to crack... Also the Greddy 20G has a funky internal Waste-Gate it would be cheaper to buy a new exhaust housing for it then port that one out... Not to mention there is not enough metal to even port the current one.

[Silviapower]

I was talking to a guy that's done a lot wit the 20G turbo's and he said you are better off going with a t3/04 for the 400hp range... The good thing is the 20G and T3/04 use the same flange... But any larger turbo with the Greddy Manifold WILL hit the power-steering reserve.

I have the kit.

Also if you are looking to upgrade your exhaust you will need to add a external waste-gate to the system. and because its a cast manifold its better cost to just have a new log Mani made for the setup then weld it on... I put my name on the waiting list to have them custom make a full tabular Mani and down-pipe for my setup...

Also the kit comes with 370cc injectors... so for 400hp you will need to run MASSIVE fuel pressure or upgrade the injectors again...

All in all this is a Kit to buy and leave alone... If you want more power then build your own kit or get a Boost Designs kit...

I'm sure I will run into more issues with this kit soon.

(The best way to learn is make mistakes.)

EDIT: Right now I am having a Tial 38mm Waste-Gate added to the cast Greddy Mani... This should work out for a little while... We will see how long it takes to crack... Also the Greddy 20G has a funky internal Waste-Gate it would be cheaper to buy a new exhaust housing for it then port that one out... Not to mention there is not enough metal to even port the current one.

So you have this kit(greddy turbo kit) right. How much power you get if you max out the kit without changing anything on the kit i.e injectors wastegate?

Im just asking because i think I could get a bigger injector for really cheap like dirt cheap? And tune accordingly. This is the only thing in kit that limit power right. What is wrong with the internal wastegate that comes with the kit, is it that u don't like it or it has somekind of a mechanical problem later on.

You already know my situation, I live in Socal which is california and I like the STICKER that say f*ck off to cops around here.

If I'm going to build my kit thats is still illegal so i better off getting my SR.

[Red-KAT]

Anything you do that will change the kit they send you automatically makes it illegal period. Cant get around that.

I live in Washington so what I do to my car does not matter... Only what comes out the tail matters. Only reason I went with Greddy is... No one had it... And it looked better then Nsport or F-Max at the time... (Boy was I wrong)

So anyways... How high can the Greddy kit go? You can max out the 370cc injectors easy... I have done this. I upped my base fuel pressure to 60psi to avoid lean at top end. I use to max them at 10psi... Now I have hit 14psi and was still 12/1... But injectors were at 100% for a while... (not good)

The Waste-gate is 20mm... the 2.5 down-pipe to Full 3" makes that to small... say hello to 14psi. that's with no cat or silencer... W/ silencer boost hits about 12psi. with stock cat I could hold it at 8psi no issue...

Also my internal Waste-gate flapper broke off... Its sitting is some ditch right now collecting dirt... Now I don't spool until the 20mm hole is to small to out flow my car and I hit 12psi at 4.5k...

There is no way to keep your power goal legal... in CA that is...

[Silviapower]

I see what you mean, I was just thinking that they, the police would never check every part of the kit or do they. Like they gonna go hey thats a different injector and thats illegal.

So what you mean is that just for example I buy the kit, after that i have to buy a new injector and a wastegate just to make more power. The piggy back that comes with it e-manage can handle it right.

Im not really familiar with proper wastegate usage. I totally don't get it cause those internal wastegate for the stock SR turbo is small and they only come to .7 bar and need a boost controller to go high right.

Anyway I just really don't want to blow my motor up thats why i ask about what can i do to the block and the head to make that amount of power and stay at 7200 RPM.

BTW you dont really like the 20G turbo and replacing it means buying a new manifold.

[Red-KAT]

Alright... You almost got it correct... I'm not sure if this will be worded correctly.

The operation of a Wastegate is not to make power... (at least not in my mind) The Wastegate is there to keep the power down... I am going under the assumption that any Joe that will Turbo his/her car is going to add a larger exhaust at some point. Its just a given. The issue with the Greddy 20G Wastegate is it can not bypass enough air to keep the boost down if you have an exhaust with to much flow... Flow on a turbo car is a must to create less lag.

Also adding a wastegate to a cast mani is as I said... A *****... It should be done propper by mating 2 metals that are the same.

[Silviapower]

I see i got it greddy got cheap with the whole thing

thank