It seems that there's always been a comparison between the 16 billet

setup and the a28 setup. There's the implication that the a28 is a

similar turbo and that moving up from a k16g or 16 billet isn't a

significant difference to justify the money.

I'm posting an overlay of my k16 billet setup and my a28 car. Both

setups were and are extensively mod supported. In fact, both setups

broke their respective 60-130 records on 6speed. Both setups were

performed on the same dyno and the conditions were very similar.

I thought this might help some guys who are on the fence and maybe

put to rest some of the speculation and armchair mechanic philosophies.

The a28s really do out spool the k16s and power under the curve is

a little more then marginal.

In other words, it's about as apples to apples that you can get without

qualifying for a debilitating case of ocd.

 

if im correct thats at 1.4 bar on ms 109 for both. very nice comparison. i think the biggest issue when considering 28's is everyone wants to go 3071 or bigger because the cost is so close.

 

Just for clarification I thought you had 16g's as in upgraded k16's but not the billets.

 

Good point! Actually, 3076s can be cheaper because low end torque

isn't an issue so you don't have to build the motor! If you wanna run

more then 1.4 bar on 28s you better build the motor

If a fellow is looking for a street / track setup that'll run with the big

dogs, the alpha 28 car is just what the Dr. ordered. The 16 billet is a

good setup but it's not in the same league. You have to compare the

28s to the 3071s and 3076s IMHO. Look at the area under the curve Steve

 

You are correct sir! Interestingly enough, no billet car has even come close

to my 5.87 60-130 record.

Those 1500.00 Vivid racing turbos produces consistent 6.0s 60-130

and I even recorded a 10.7 1/4 @ 132 or 133 on the vbox. I'm sure

a better 1/4 mile driver on a prepped track could have easily got 10.5s

at 135ish.

 

Either way I'm pretty impressed with how quickly the turbo that is making more power spools up compared to the 16g. I wonder where the 3071 spools up compared to the 28.

 

You do have very good results indeed and Markski did a great job for you..Congrats again.
But I to say, I have seen a few Dyno comparisons from switching from A28s to 3071s with the pretty much the same mods /fuel and the 3071s made so so much more on the upper mid to high band that the little that was lost on the low mid to the A28s was nothing compared to the gains after that..
So I believe the 3071s would be easier to live with, less hard of a hit down low, and easier on the rods if the boost wasnt over done..
Just my info and my thoughts...

 

That's a good question, but I bet they don't keep up with the a28s!

The 3071s look like a great setup though. They'll put down 680+ whp

and word has it, they're not as laggy as the 3076s. The 3076s never

appealed to me because I think it relegates the car to straight line

performance. "Interstate pulls"

 

I think you make a good argument for the 3071s and I've seen some of those

comparisons with my own two eyes! The difference down low is a major

consideration if you are going to track the car and if you're gonna enjoy

twisties on the road. The 28 car will annihilate the 3071s, and 3076s for that

matter, on the track or twisties.

For most peeps I think the 3071s make more sense, on that we agree

 

Too many good setups make it very difficult to decide on which one I want. It will probably be a year or so before I want to throw the cash down on everything anyway so I have time to decide.

I don't think I have easy access to race gas so I really want to stick to 1.0-1.2 bar of boost. Like you, I also want something that is good at everything from the twisties to the strip. I don't know if I am chasing a unicorn but hopefully what I want exists. High 500's to the wheels with manageable lag so it doesn't take me by surprise mid turn all at about 1.0 bar on pump with no meth/water injection (I like simplicity, too [so why the hell am I in a turbo car?]).

 

Everyone has there own style of driving and preference of how they want to use the power..
I am a small block guy not a big block guy..
I rather down shift,worry less about traction ,chassis and clutch issues off the line> Rather then deal with a hard and low TQ hit to control ...
Thats why I went with K24/18gs over 16 Billets,,,plus I can drive my car all year around without worrying about rapping it around a pole...LOL..
Thats why IF and when I go to the next level it will be 3071s which will still come in a little quicker then the 18s..

 

lol at simplicity and turbocharged Porches

The 18g is a very cost effective setup and it's track worthy!

You just gotta set the spring at .08 bar and use a greddy ebc. Very

manageable setup on the track. It's also a very quick car as Johnspeed

and a couple dozen others can attest. It'll give you high 500s to the wheels

on race gas and mid 500s on 93 pump. If you peel off 250 - 350 lbs and run

meth 50/50 you'll be plenty quick

 

The 18gs seem to be THE best bang for the buck. You and everybody else

that's got 'em or had 'em, have nothing but positive things to say about them

The low end torque on the 28s is easily managed and traction isn't much of

an issue with the r888s. I ran a 5.8 0-100 mph on a 6 speed!!!

Word has it that Tial has an upgrade for the a28s that'll net 60 whp with

no additional lag

 

I have done 600Hp/TQ to the rear wheels on 93 pump gas already,,as my dyno sheets are posted in past threads on several dynos...
But I do have some lag but not that much to bother me but my HP curve has dips,, it is not as linear and nice as yours...

 

The 16g graph is @ 1.45 bar and the a28 is 1.65 bar. The 16g setup died

at 1.5o bar so the 1.45 was near the peak of their performance.

Remember we ran the a28s past 1.75 and they stopped making power.

With straight pipes and c16 the alphas should push 1.85 bar and make roughly

680 whp. Prolly good for 4.9s 60-130