In the rear of my hyper 7 PCr will harder springs give me less grip or more? How about in the front is it different?

Usually it will give you less grip but it will make the buggy more stable on a smooth track. If your track is rough the buggy will bounce more because you get faster rebound and if you raise the shock oil to slow the rebound then you bounce because you have to much dampening. So if you race on a smooth track then go for the stiffer springs and higher shock oil... if your track is rough then stay with medium or soft springs. Normally softer suspension will give you more grip (more weight transfer to plant the tires that matter most in the corner) but a harder suspension will make the buggy more stable and react faster on a smooth track. It really depends on the balance between front a rear grip... if you have a lot of front grip you'll oversteer and if you have a lot of rear grip you'll understeer.

If your looking for more steering then here are some front end changes you should try. Get less caster, move the linkage on your ackerman to the back hole, more toe out in the front, a roll center that will keep the wheel more upright when the suspension is compressed, a slightly softer front suspension, or a lighter front diff oil (the diff oil will take away some on throttle steering but give you better initial turn in).

Hi,

Harder springs give you better luck on rough terrain and landing big jumps.
Soft springs are ideal for smooth tracks. But chassis bottoms out easily on rough section and when landing jumps.

Regards

Joaquim

you 2 just said the opposite thing.

Super dave, you said that harder spring are for smoother tracks, which is what i thought.
Walawala you said harder spring for a roughr track.

Which of you is right??

Also on a completely different note does any1 know if rear shock spring for the hyper 8 will work with the Hyper 7 PBS shocks ( i think there the regular hyper 7 shocks)?

Im preatty sure the springs will work, but just wanna make sure.

Well we can compair this to scale racing. Which has harder suspension... the le mans Corvette C6 or the Off-Road Baja truck? Soft suspension will give you more grip because of weight transfer but like I said before a balance of front and rear grip is what your looking for not just straight grip. Harder suspension will give you a much more direct and responcive feel and it will be much more consistant handling which is why its good on smooth tracks. Also a smooth track will more then likley be very hard packed which will give you more grip with the right tires compaired to a dry/loose track. The soft suspension is designed mainly to soak up bumps and keep the tires planted on the track without upsetting the chassis which the hard springs will make you bounce and upset the chassis on a rough track.

I honestly don't know about the spring issue but if you look on NitroHouse they recommend using only the hyper 8 springs for the hyper 8 shocks. Nitrohouse has a good price for those springs too just incase you are planning on buying them.

Generally I think smooth track = harder setup and bumpy = softer.

I tried a hard setup on a smooth but loose track and got a very consistent feel compared to a soft setup. Both setups felt loose but with the soft setup the car could suddenly dig-in in corners and just swing around. The hard setup took care of that and made the car consistent.
Once the track got rutted I should have switched back to the soft setup as I couldn't put the power down at all.

Well ofna said they will fit, but they might be just a hair longer,

Hi

The harder the spring the more the tire will bounce up and down.
The softer the spring the less the tire will bounce up and down.

With softer springs your shocks will absorbe more inpact form bumps and your tires will have more contact with the ground and more traction.

Ok on a different note, What does it mean when on the Hyper 7 set-up sheet from OFNA.com Ryan Mimori used drilled 1.4 pistons? i get that it means he drilled out the piston holes, but what does the 1.4 represent? I've heard his set-up with a little tweaking for your particualr driving style works very well at my track.

HI

1.4mm

WHAT!!! I hope you were veyr rushed when you wrote that . So what does 1.4 drilled pistons mean?

it the diameter of the hole drilled in them measured in millimeters, 1.4mm

Hi

The holes in the shock pistons are enlarged to 1.4mm.

How do you do that? witWouldnt a drill melt the plastic, or do you use the bit by hand?
What size bit would i need to do this?
Also how do me know what pistons he started out with? or do we just assume the stocks.

No it wont melt the plastic and I'd say a...er... 1.4mm bit would do the job.

He didn't drill them out 1.4mm more he drilled them out to 1.4mm. So if your piston holes are already at 1.4mm then don't touch them.

IS there a certain size drill bit that fill give me a 1.4mm hole?

Can you not buy metric drill bits in the usa? if not just convert to the closest imperial size there is.