Tekin Prodigy

iTrader: (73)

Hey guys, my car has been really good for me but im struggling with something as of late. The track conditions I have been running lately would be medium to med-high grip if prepped right, and Im having an issue with corner exit with my rear end breaking loose. could be my fault and need to work on my throttle control, but I was wondering if anyone had an slight changes I can try without changing my setup to much. I just went from -1.5 to -2 degrees of camber in the rear to try and help. Would longer rear links help alos? Thank you

edhchoe

iTrader: (41)

I had the same problem until I took the rear swaybar off.

I drilled another hole in the rear arms 3mm closer to the middle for the bottom shock mounting point so I could make the rear even softer.

andrewdoherty

iTrader: (49)

Just visually, I think the 2 hole option arms would give a similar effect on the inside hole for those not wanting to drill arms...

erchn

iTrader: (7)

Most of the time when this happens with my car it's because it's transitioning to the rear to quickly when I start to apply power, and causing too much body roll, or not "returning to center" quick enough. A slightly heavier oil in the rear can help, or a slightly stiffer spring. If it's excessive roll that's the problem a shorter rear link can help.

That said, it could be over rotation due to too stiff of a spring. Without setup details it's hard to know which. Look at Martin Crisp's setup app, many times the advice is to do "this change", or the exact opposite of "this change".

IOW, as the above poster mentioned, a softer rear spring worked for them, but it could also be too soft. More detail is needed.

E

erchn

iTrader: (7)

I agree with 99% of what's said here, but I'm confused by one point. 2.5s didn't provide enough roll, but a thinner bar would have made things worse. Was it roll that was needed or was it initial steering provided by the stiffer bar and weight on the tires that was needed?

Not sure if you saw the setup I ran, and if it was due to my running open class that made my recipe work, but my car felt really good. I would highly suggest any of the open guys to give it a shot. If I need to repost, LMK.
E

tc3team

I'm very interested in getting a T4.

But I will be racing it with foams and a front differential due to the nature of the track. (carpet, very small technical track, a spool isnt suited to it) so I have a few questions so I am 99.9% sure I will need additional parts from the start.

1) Can anyone tell me if 30mm wide foams will fit? (no big deal if they do not).

2) Can anyone confirm the part numbers needed for a front diff (and I am assuming I will need a packet of driveshaft sleeves too?)

I think the #s are

304900 and 305241

3) Are there any particular build tips not mentioned in the manual that are worth noting?

Many thanks!

artwork

iTrader: (88)

I ended up running 2.3s...but I started with 2.5s. I believe I got the roll I needed with the 2.3s. 2.5s just felt too stiff in mod.

A thinner bar in the front would have helped mid and exit...but I needed more initial turn in. After talking to Paul we both agreed that a thinner bar was probably not the right approach.

I have not seen your setup but I am interested to see how it differed.

Matt W

Hi

What are the main differences in handling between narrowing the front wheel track by using thinner wheel hexes or using smaller washers on the wishbone mounts?

erchn

iTrader: (7)

Gotchya, thanks.

I think this setup worked well because I got the roll I wanted by running a very light or no bar. I'd like to try lower roll centers though, I'll give it a shot next time out.

For reference, the spring chart here shows the spring stiffness comparison, it's a pretty big jump to Red springs from the standard 2.5 or 2.3.

erchn

iTrader: (7)

For me, narrowing at the arm holders makes the car more twitchy off center, responds more quickly. I usually tune the other direction, wider to calm the car down, if anything. It should technically make the front-end stiffer as well, as the shock will be more upright.

Narrower hexes can make the car react a bit quicker, and feel a little less stable.

TT_Vert

iTrader: (72)

What are your guys opinion on the RSD spring vs. the Spec-R spring vs. the Xray springs? Is there a good reason to go w/ one over another? RSD carries the spec R kit at half the price of their own springs. Just curious what you guys think.

Thanks
Dave

CristianTabush

iTrader: (13)

The Spec R Springs are too long for the XRAY T4. They are great springs though.

erchn

iTrader: (7)

I think no two springs are created equally. It's all about tuning options.

TryHard

iTrader: (4)

Not normally one to post in here, but I read your top comment with interest, as I actually feel the opposite. On very bumpy tracks, I tend to reduce the pack as much as possible, as otherwise the car will 'skip' over the surface. This is especially the case, IMO, in mod, where your tending to hit the bumps harder. Thats why I tend to use 4hole pistons on my 411, but with a heavier oil.. this works in combination to reduce the pack (and hence make the high speed damping softer), whilst maintaining the body control (low speed damping). This is different to rebound mind, which is what tends to be set to help the tyres to stay in countact, again, IMO.

Do agree with this, and same also goes for diff oils too... all the oils we use are susceptable to heat, and thin out at higher temps.

Totally agree that a heavier oil helps to mellow the car, as it numbs the response time. Soft springs and heavy oil seems to work well on high grip, to help avoid traction roll, and make an easier to drive car.

Don't really agree with this, as I feel that it's more related to rebound setting, rather than the pack. Higher rebound will help to push the piston back down, and hence help to keep the tyres in contact with the ground.

Overall though, I do these days prefer a 4hole piston over a 3hole, certainly outdoors. My target there is to have a shock setup that is supple over the bumps, but still with a decent level of roll control... which comes down to tweaking the shocks to alter the high and low speed damping.

Regards
Ed

JOE SI

iTrader: (13)

Tryhards post is the reason I post on here, to get everyone's opinion on a certain subject